Question 1: Palette 1/176

JEE Mains 2026 MCQ

Structures of four disaccharides are given below. Among the given disaccharides, the non-reducing sugar is :

A

B

C

D

Question 2: Palette 2/176

JEE Mains 2026 MCQ

In the given pentapeptide, find out an essential amino acid $(\mathrm{Y})$ and the sequence present in the pentapeptide :

$ \text { Choose the correct answer from the options given below : } $

A

$ \begin{array}{|c|c|} \hline \text { (Y) } & \text { (Sequence) } \\ \hline \hline \text { Serine } & \text { Thr-Ser-Asp-Ala-Gly } \\ \hline \end{array} $

B

$ \begin{array}{|c|c|} \hline \text { (Y) } & \text { (Sequence) } \\ \hline \hline \text { Serine } & \text { Ser-Asp-Thr-Ala-Gly } \\ \hline \end{array} $

C

$ \begin{array}{|c|c|} \hline \text { (Y) } & \text { (Sequence) } \\ \hline \hline \text { Threonine } & \text { Ser-Thr-Asp-Gly-Ala } \\ \hline \end{array} $

D

$ \begin{array}{|c|c|} \hline \text { (Y) } & \text { (Sequence) } \\ \hline \hline \text { Threonine } & \text { Thr-Ser-Asp-Gly-Ala } \\ \hline \end{array} $

Question 3: Palette 3/176

JEE Mains 2026 MCQ

The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is:

A

8

B

3

C

4

D

6

Question 4: Palette 4/176

JEE Mains 2026 MCQ

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

A

L-sugar component

B

D-sugar component

C

Chiral phosphate unit

D

Base unit

Question 5: Palette 5/176

JEE Mains 2026 MCQ

$ \text { Match List - I with List - II. } $

List - I Reaction of Glucose with		List - II Product formed
A.	Hydroxylamine	I.	Gluconic acid
B.	$\mathrm{Br}_2$ water	II.	Glucose pentacetate
C.	Excess acetic anhydride	III.	Saccharic acid
D.	Concentrated $\mathrm{HNO}_3$	IV.	Glucoxime

Choose the correct answer from the options given below :

A

A-IV, B-III, C-II, D-I

B

A-I, B-III, C-IV, D-II

C

A-III, B-I, C-IV, D-II

D

A-IV, B-I, C-II, D-III

Question 6: Palette 6/176

JEE Mains 2026 MCQ

Given below are two statements :

Statement I : Sucrose is dextrorotatory. However, sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation.

Statement II : Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose, the resulting solution becomes laevorotatory.

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are false

B

Both Statement I and Statement II are true

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

Question 7: Palette 7/176

JEE Mains 2026 MCQ

The correct statements are :

A. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis.

B. During denaturation, secondary and tertiary structures of a protein are destroyed but primary structure remains intact.

C. Nucleotides are joined together by glycosidic linkage between $\mathrm{C}_1$ and $\mathrm{C}_4$ carbons of the pentose sugar.

D. Quaternary structure of proteins represents overall folding of the polypeptide chain.

Choose the correct answer from the options given below :

A

A, B and D Only

B

A, C and D Only

C

B and C Only

D

A and B Only

Question 8: Palette 8/176

JEE Mains 2026 MCQ

Identify the correct statements.

A. Arginine and Tryptophan are essential amino acids.

B. Histidine does not contain heterocyclic ring in its structure.

C. Proline is a six membered cyclic ring amino acid.

D. Glycine does not have chiral centre.

E. Cysteine has characteristic feature of side chain as $\mathrm{MeS}-\mathrm{CH}_2-\mathrm{CH}_2-$.

Choose the correct answer from the options given below :

A

C and D Only

B

A and D Only

C

C and E Only

D

B and E Only

Question 9: Palette 9/176

JEE Mains 2026 MCQ

The incorrect statement from the following with respect to carbohydrates is :

A

All monosaccharides are reducing sugars.

B

The monosaccharide units obtained from hydrolysis of oligosaccharides are always the same.

C

Starch and cellulose are typical examples of polysaccharides, which are very high molecular weight compounds of more than ten monosaccharide units.

D

Open chain and cyclic structures co-exist at equilibrium that are responsible for certain properties as in the case of $\mathrm{D}-(+)$-glucose.

Question 10: Palette 10/176

JEE Mains 2026 MCQ

$ \text { Match the List-I with List-II } $

List-I Deficiency Disease		List-I Vitamin
A.	Scurvy	I.	Pyridoxine
B.	Convulsions	II.	Vitamin A
C.	Cheilosis	III.	Ascorbic Acid
D.	Xerophthalmia	IV.	Riboflavin

Choose the correct answer from the options given below :

A

A-I, B-III, C-II, D-IV

B

A-I, B-III, C-IV, D-II

C

A-III, B-I, C-IV, D-II

D

A-III, B-I, C-II, D-IV

Question 11: Palette 11/176

JEE Mains 2026 MCQ

$ \text { Match the List-I with List-II } $

$ \begin{gathered} \text { List-I } \\ \text { Amino acid } \end{gathered} $		List-II Positive reaction/Test for functional group present in side chain of amino acid
A.	Glutamine	I.	Hinsberg's test
B.	Lysine	II.	Neutral $\mathrm{FeCl}_3$ test
C.	Tyrosine	III.	Ceric ammonium nitrate test
D.	Serine	IV.	Hoffman bromamide degradation

Choose the correct answer from the options given below :

A

A-IV, B-II, C-I, D-III

B

A-IV, B-I, C-II, D-III

C

A-III, B-II, C-I, D-IV

D

A-IV, B-I, C-III, D-II

Question 12: Palette 12/176

JEE Mains 2026 MCQ

Identify the incorrect statement about tertiary structure of proteins.

A

They can be fibrous or globular in structure.

B

The main forces that stabilize the structure are hydrogen bonding, disulphide links, van der Waals and electrostatic forces of attraction.

C

The structure remains intact when exposed to pH changes.

D

A linear polypeptide chain will convert to a secondary structure and then further folding of the secondary structure will convert to tertiary structure.

Question 13: Palette 13/176

JEE Mains 2026 MCQ

$ \text { Given below are two statements : } $

$ \text { Statement I : } $ and are two anomers of D-(+)-glucode.

Statement II : The open chain forms of D-glucose and D- fructose contain three similar chiral carbons at $\mathrm{C}_3, \mathrm{C}_4$ and $\mathrm{C}_5$.

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

Question 14: Palette 14/176

JEE Mains 2026 MCQ

Identify the correct statements.

A. Glucose exists in two anomeric forms.

B. Anomers of glucose differ in configuration at $\mathrm{C}-1$ in cyclic hemiacetal structure.

C. Melting point of $\alpha$ - anomer of glucose is greater than $\beta$ - anomer.

D. Specific rotation of $\alpha$ - anomer is $+19^{\circ}$ while for $\beta$ - anomer is $+112^{\circ}$

E. $\alpha$ and $\beta$ - anomers of glucose are prepared by crystallization of saturated glucose solution at 303 K and 371 K respectively.

Choose the correct answer from the options given below :

A

A and B Only

B

B and C Only

C

A, B and D Only

D

A, B and E Only

Question 15: Palette 15/176

JEE Mains 2026 MCQ

A D-aldotetrose on oxidation with concentrated $\mathrm{HNO}_3$ resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is :

A

B

C

D

Question 16: Palette 16/176

JEE Mains 2026 MCQ

Given below are two statements :

Statement I : The structure of Maltose is given below:

Statement II : The structure of Lactose is given below :

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

Question 17: Palette 17/176

JEE Mains 2026 MCQ

Match the List-I with List-II

List-I Name of amino acid	List-II One letter symbol/type
A. Arginine	I. D/Non-essential
B. Aspartic acid	II. R/Essential
C. Lysine	III. E/Non-essential
D. Glutamic acid	IV. K/Essential

Choose the correct answer from the options given below :

A

A-II, B-I, C-IV, D-III

B

A-IV, B-III, C-II, D-I

C

A-III, B-IV, C-I, D-II

D

A-II, B-IV, C-I, D-III

Question 18: Palette 18/176

JEE Mains 2026 MCQ

Identify the correct pair having amino acid (A) and the hormone (B) that is iodinated derivative of the amino acid (A).

(T and Y represent one letter code for amino acids)

A

Amino acid (A) - T    Hormone (B) - Insulin

B

Amino acid (A) - T    Hormone (B) - Thyroxine

C

Amino acid (A) - Y   Hormone (B) - Thyroxine

D

Amino acid (A) - Y   Hormone (B) - Insulin

Question 19: Palette 19/176

JEE Mains 2026 MCQ

Match List - I with List - II.

	List - I Vitamin		List - II Name
A	Vitamin B1	I	Pyridoxine
B	Vitamin B2	II	Ascorbic acid
C	Vitamin B6	III	Thiamine
D	Vitamin C	IV	Riboflavin

Choose the correct answer from the options given below:

A

A-II, B-I, C-III, D-IV

B

A-IV, B-III, C-II, D-I

C

A-III, B-IV, C-I, D-II

D

A-I, B-III, C-II, D-IV

Question 20: Palette 20/176

JEE Mains 2025 MCQ

Given below are two statements :

Statement (I) : On hydrolysis, oligo peptides give rise to fewer number of α-amino acids while proteins give rise to a large number of β-amino acids.

Statement (II) : Natural proteins are denatured by acids which convert the water soluble form of fibrous proteins to their water insoluble form.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

Statement I is incorrect but Statement II is correct

B

Both Statement I and Statement II are incorrect

C

Both Statement I and Statement II are correct

D

Statement I is correct but Statement II is incorrect

Question 21: Palette 21/176

JEE Mains 2025 MCQ

Given below are two statements:

Statement I: D-(+)-glucose + D-(+) fructose $\xrightarrow{-\mathrm{H}_2 \mathrm{O}}$ Sucrose

$\text { sucrose } \xrightarrow{\text { hydrolysis }} \mathrm{D}-(+) \text { glucose }+\mathrm{D}-(+) \text { fructose }$

Statement II: Invert sugar is formed during sucrose hydrolysis

In the light of the above statements, choose the correct answer from the options given below

A

Both Statement I and Statement II are False

B

Statement I is false but Statement II are true

C

Both Statement I and Statement II are true

D

Statement I is true but Statement II is false

Question 22: Palette 22/176

JEE Mains 2025 MCQ

A dipeptide, " $x$ " on complete hydrolysis gives " $y$ " and " $z$ ". " $y$ " on treatment with aq. $\mathrm{HNO}_2$ produces lactic acid. On the other hand " z " on heating gives the following cyclic molecule.

Based on the information given, the dipeptide $X$ is :

A

alanine-alanine

B

valine-glycine

C

valine-leucine

D

alanine-glycine

Question 23: Palette 23/176

JEE Mains 2025 MCQ

Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.

A

B

C

D

Question 24: Palette 24/176

JEE Mains 2025 MCQ

Fat soluble vitamins are:

A. Vitamin $\mathrm{B}_1$

B. Vitamin C

C. Vitamin E

D. Vitamin B 12

E. Vitamin K

Choose the correct answer from the options given below:

A

B & C Only

B

C & D Only

C

C & E Only

D

A & B Only

Question 25: Palette 25/176

JEE Mains 2025 MCQ

$ \text { Which of the following is the correct structure of L-Fructose? } $

A

B

C

D

Question 26: Palette 26/176

JEE Mains 2025 MCQ

A tetrapeptide, " $x$ " on complete hydrolysis produced glycine (Gly), alanine (Ala), valine (Val), leucine (Leu) in equimolar proportion each. The number of tetrapeptides (sequences) possible involving each of these amino acids is :

A

32

B

24

C

8

D

16

Question 27: Palette 27/176

JEE Mains 2025 MCQ

Identify the correct statement among the following :

A

All naturally occurring amino acids except glycine contain one chiral centre.

B

Amino acid, cysteine can easily undergo dimerisation due to the presence of free SH group.

C

Glutamic acid is the only amino acid that contains a $-$COOH group at the side chain.

D

All naturally occurring amino acids are optically active.

Question 28: Palette 28/176

JEE Mains 2025 MCQ

Identify the essential amino acids from below:

(A) Valine

(B) Proline

(C) Lysine

(D) Threonine

(E) Tyrosine

Choose the correct answer from the options given below:

A

(A), (C) and (D) only

B

(C), (D) and (E) only

C

(A), (C) and (E) only

D

(B), (C) and (E) only

Question 29: Palette 29/176

JEE Mains 2025 MCQ

Match List - I with List - II.

List - I (Carbohydrate)	List - II (Linkage Source)
(A) Amylose	(I) $\beta$ - $C_1 - C_4$, plant
(B) Cellulose	(II) $\alpha$ - $C_1 - C_4$, animal
(C) Glycogen	(III) $\alpha$ - $C_1 - C_4$, $\alpha$ - $C_1 - C_6$, plant
(D) Amylopectin	(IV) $\alpha$ - $C_1 - C_4$, plant

Choose the correct answer from the options given below :

A

(A)-(II), (B)-(III), (C)-(I), (D)-(IV)

B

(A)-(III), (B)-(III), (C)-(I), (D)-(IV)

C

(A)-(IV), (B)-(I), (C)-(III), (D)-(II)

D

(A)-(IV), (B)-(I), (C)-(II), (D)-(III)

Question 30: Palette 30/176

JEE Mains 2025 MCQ

Match List-I with List-II.

List - I (Saccharides)	List - II (Glycosidic-linkages found)
(A) Sucrose	(I) α 1 $-$ 4
(B) Maltose	(II) α 1 $-$ 4 and α 1 $-$ 6
(C) Lactose	(III) α 1 $-$ β 2
(D) Amylopectin	(IV) β 1 $-$ 4

Choose the correct answer from the options given below :

A

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

B

(A)-(I), (B)-(II), (C)-(III), (D)-(IV)

C

(A)-(II), (B)-(IV), (C)-(III), (D)-(I)

D

(A)-(IV), (B)-(II), (C)-(I), (D)-(III)

Question 31: Palette 31/176

JEE Mains 2025 MCQ

Identify correct conversion during acidic hydrolysis from the following :

(A) starch gives galactose.

(B) cane sugar gives equal amount of glucose and fructose.

(C) milk sugar gives glucose and galactose.

(D) amylopectin gives glucose and fructose.

(E) amylose gives only glucose.

Choose the correct answer from the options given below :

A

(A), (B) and (C) only

B

(B), (C) and (D) only

C

(B), (C) and (E) only

D

(C), (D) and (E) only

Question 32: Palette 32/176

JEE Mains 2025 MCQ

Given below are two statements:

Statement I : D-glucose pentaacetate reacts with 2,4 -dinitrophenylhydrazine

Statement II : Starch, on heating with concentrated sulfuric acid at $100^{\circ} \mathrm{C}$ and $2-3 \mathrm{atmosphere}$ pressure produces glucose.

In the light of the above statements, choose the correct answer from the options given below

A

Statement I is true but Statement II is false

B

Both Statement I and Statement II are true

C

Statement I is false but Statement II is true

D

Both Statement I and Statement II are false

Question 33: Palette 33/176

JEE Mains 2025 MCQ

Match List - I with List - II.

	List - I		List - II
(A)	Adenine	(I)
(B)	Cytosine	(II)
(C)	Thymine	(III)
(D)	Uracil	(IV)

Choose the correct answer from the options given below :

A

(A)-(IV), (B)-(III), (C)-(II), (D)-(I)

B

(A)-(III), (B)-(IV), (C)-(II), (D)-(I)

C

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

D

(A)-(III), (B)-(IV), (C)-(I), (D)-(II)

Question 34: Palette 34/176

JEE Mains 2025 MCQ

The carbohydrate "Ribose" present in DNA, is

A. A pentose sugar

B. present in pyranose from

C. in "D" configuration

D. a reducing sugar, when free

E. in $\propto$-anomeric form

Choose the correct answer from the options given below:

A

  A, D and E Only

B

B, D and E Only

C

A, C and D Only

D

A, B and E Only

Question 35: Palette 35/176

JEE Mains 2025 MCQ

The $\alpha$-Helix and $\beta$ - Pleated sheet structures of protein are associated with its :

A

tertiary structure

B

quaternary structure

C

primary structure

D

secondary structure

Question 36: Palette 36/176

JEE Mains 2025 MCQ

Given below are two statements:

Statement I: Fructose does not contain an aldehydic group but still reduces Tollen's reagent

Statement II: In the presence of base, fructose undergoes rearrangement to give glucose.

In the light of the above statements, choose the correct answer from the options given below

A

Statement I is true but Statement II is false

B

Statement I is false but Statement II is true

C

Both Statement I and Statement II are true

D

Both Statement I and Statement II are false

Question 37: Palette 37/176

JEE Mains 2025 MCQ

Identify the number of structure/s from the following which can be corelated to D-glyceraldehyde.

A

three

B

two

C

one

D

four

Question 38: Palette 38/176

JEE Mains 2025 MCQ

Which of the following acids is a vitamin ?

A

Saccharic acid

B

Ascorbic acid

C

Aspartic acid

D

Adipic acid

Question 39: Palette 39/176

JEE Mains 2024 MCQ

The incorrect statement about Glucose is :

A

Glucose remains in multiple isomeric form in its aqueous solution

B

Glucose is soluble in water because of having aldehyde functional group

C

Glucose is an aldohexose

D

Glucose is one of the monomer unit in sucrose

Question 40: Palette 40/176

JEE Mains 2024 MCQ

The $\mathrm{F}^{-}$ ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula.

A

$\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{CaF}_2\right]$

B

$\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{Ca}(\mathrm{OH})_2\right]$

C

$\left[3\left(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_3\right) \cdot \mathrm{CaF}_2\right]$

D

$\left[3\left(\mathrm{Ca}_2\left(\mathrm{PO}_4\right)_2\right) \cdot \mathrm{Ca}(\mathrm{OH})_2\right]$

Question 41: Palette 41/176

JEE Mains 2024 MCQ

The incorrect statement regarding the given structure is

A

can be oxidized to a dicarboxylic acid with $\mathrm{Br}_2$ water

B

despite the presence of $-\mathrm{CHO}$ does not give Schiff's test

C

will coexist in equilibrium with 2 other cyclic structure

D

has 4 asymmetric carbon atom

Question 42: Palette 42/176

JEE Mains 2024 MCQ

The incorrect statements regarding enzymes are :

(A) Enzymes are biocatalysts.

(B) Enzymes are non-specific and can catalyse different kinds of reactions.

(C) Most Enzymes are globular proteins.

(D) Enzyme - oxidase catalyses the hydrolysis of maltose into glucose.

Choose the correct answer from the option given below :

A

(B) and (D)

B

(A), (B) and (C)

C

(B) and (C)

D

(B), (C) and (D)

Question 43: Palette 43/176

JEE Mains 2024 MCQ

DNA molecule contains 4 bases whose structure are shown below. One of the structures is not correct, identify the incorrect base structure.

A

B

C

D

Question 44: Palette 44/176

JEE Mains 2024 MCQ

Coagulation of egg, on heating is because of :

A

Denaturation of protein occurs

B

Biological property of protein remains unchanged

C

Breaking of the peptide linkage in the primary structure of protein occurs

D

The secondary structure of protein remains unchanged

Question 45: Palette 45/176

JEE Mains 2024 MCQ

Which of the following gives a positive test with ninhydrin ?

A

Polyvinyl chloride

B

Cellulose

C

Egg albumin

D

Starch

Question 46: Palette 46/176

JEE Mains 2024 MCQ

Match List I with List II

	LIST I		LIST II
A.	$\alpha$ - Glucose and $\alpha$ - Galactose	I.	Functional isomers
B.	$ \alpha \text { - Glucose and } \beta \text { - Glucose } $	II.	Homologous
C.	$ \alpha \text { - Glucose and } \alpha \text { - Fructose } $	III.	Anomers
D.	$ \alpha \text { - Glucose and } \alpha \text { - Ribose } $	IV.	Epimers

Choose the correct answer from the options given below:

A

A-III, B-IV, C-II, D-I

B

A-IV, B-III, C-I, D-II

C

A-III, B-IV, C-I, D-II

D

A-IV, B-III, C-II, D-I

Question 47: Palette 47/176

JEE Mains 2024 MCQ

Which of the following is the correct structure of L-Glucose?

A

B

C

D

Question 48: Palette 48/176

JEE Mains 2024 MCQ

If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is :

A

CATTAGCT

B

TACGAAGT

C

ATGCGACT

D

GTACTTAC

Question 49: Palette 49/176

JEE Mains 2024 MCQ

Match List I with List II

	List - I		List - II
(A)	Glucose/$\mathrm{NaHCO_3/\Delta}$	(I)	Gluconic acid
(B)	$\text { Glucose } / \mathrm{HNO}_3$	(II)	No reaction
(C)	$\text { Glucose } / \mathrm{HI} / \Delta$	(III)	n-hexane
(D)	Glucose/Bromine water	(IV)	Saccharic acid

Choose the correct answer from the options given below:

A

A-II, B-IV, C-III, D-I

B

A-III, B-II, C-I, D-IV

C

A-IV, B-I, C-III, D-II

D

A-I, B-IV, C-III, D-II

Question 50: Palette 50/176

JEE Mains 2024 MCQ

Sugar which does not give reddish brown precipitate with Fehling's reagent, is :

A

Glucose

B

Sucrose

C

Lactose

D

Maltose

Question 51: Palette 51/176

JEE Mains 2024 MCQ

Match List I with List II

	List - I (Bio Polymer)		List - II (Monomer)
(A)	Starch	(I)	nucleotide
(B)	Cellulose	(II)	$\alpha$-glucose
(C)	Nucleic acid	(III)	$\beta$-glucose
(D)	Protein	(IV)	$\alpha$-amino acid

Choose the correct answer from the options given below:

A

A-IV, B-II, C-I, D-III

B

A-I, B-III, C-IV, D-II

C

A-II, B-I, C-III, D-IV

D

A-II, B-III, C-I, D-IV

Question 52: Palette 52/176

JEE Mains 2024 MCQ

Type of amino acids obtained by hydrolysis of proteins is :

A

$\gamma$

B

$\beta$

C

$\alpha$

D

$\delta$

Question 53: Palette 53/176

JEE Mains 2024 MCQ

Which structure of protein remains intact after coagulation of egg white on boiling?

A

Quaternary

B

Primary

C

Secondary

D

Tertiary

Question 54: Palette 54/176

JEE Mains 2024 MCQ

Two nucleotides are joined together by a linkage known as :

A

Phosphodiester linkage

B

Glycosidic linkage

C

Disulphide linkage

D

Peptide linkage

Question 55: Palette 55/176

JEE Mains 2023 MCQ

Which is not true for arginine?

A

It has a fairly high melting point.

B

It is associated with more than one $\mathrm{pK}_{\mathrm{a}}$ values.

C

It has high solubility in benzene.

D

It is a crystalline solid.

Question 56: Palette 56/176

JEE Mains 2023 MCQ

The naturally occurring amino acid that contains only one basic functional group in its chemical structure is

A

asparagine

B

arginine

C

histidine

D

lysine

Question 57: Palette 57/176

JEE Mains 2023 MCQ

The products formed in the above reaction are

A

Two optically active products

B

One optically active and one meso product

C

Two optically inactive products

D

One optically inactive and one meso product.

Question 58: Palette 58/176

JEE Mains 2023 MCQ

L-isomer of tetrose $\mathrm{X}\left(\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{4}\right)$ gives positive Schiff's test and has two chiral carbons. On acetylation, '$\mathrm{X}$' yields triacetate. '$\mathrm{X}$' also undergoes following reactions

'$\mathrm{X}$' is

A

B

C

D

Question 59: Palette 59/176

JEE Mains 2023 MCQ

The one that does not stabilize 2$^\circ$ and 3$^\circ$ structures of proteins is

A

$-$O $-$O $-$linkage

B

$-$S $-$S $-$linkage

C

van der Waals forces

D

H-bonding

Question 60: Palette 60/176

JEE Mains 2023 MCQ

Match List I with List II

	LIST I Natural amino acid		LIST II One letter code
A.	Glutamic acid	I.	Q
B.	Glutamine	II.	W
C.	Tyrosine	III.	E
D.	Tryptophan	IV.	Y

Choose the correct answer from the options given below:

A

A-III, B-IV, C-I, D-II

B

A-IV, B-III, C-I, D-II

C

A-II, B-I, C-IV, D-III

D

A-III, B-I, C-IV, D-II

Question 61: Palette 61/176

JEE Mains 2023 MCQ

Sulphur (S) containing amino acids from the following are:

(a) isoleucine (b) cysteine (c) lysine (d) methionine (e) glutamic acid

A

b, d

B

a, d

C

b, c, e

D

a, b, c

Question 62: Palette 62/176

JEE Mains 2023 MCQ

Match List I with List II

	LIST I Natural Amino Acid		LIST II One Letter Code
A.	Arginine	I.	D
B.	Aspartic acid	II.	N
C.	Asparagine	III.	A
D.	Alanine	IV.	R

Choose the correct answer from the options given below:

A

(A) - IV, (B) - I, (C) - III, (D) - II

B

(A) - III, (B) - I, (C) - II, (D) - IV

C

(A) - IV, (B) - I, (C) - II, (D) - III

D

(A) - I, (B) - III, (C) - IV, (D) - II

Question 63: Palette 63/176

JEE Mains 2023 MCQ

Match List I with List II

	LIST I Enzymatic reaction		LIST II Enzyme
A.	Sucrose $\to$ Glocuse and Fructose	I.	Zymase
B.	Glucose $\to$ ethyl alcohol and CO$_2$	II.	Pepsin
C.	Starch $\to$ Maltose	III.	Invertase
D.	Proteins $\to$ Amino acids	IV.	Diastase

Choose the correct answer from the options given below:

A

A-III, B-I, C-II, D-IV

B

A-III, B-I, C-IV, D-II

C

A-I, B-IV, C-III, D-II

D

A-I, B-II, C-IV, D-III

Question 64: Palette 64/176

JEE Mains 2023 MCQ

All structures given below are of vitamin C. Most stable of them is :

A

B

C

D

Question 65: Palette 65/176

JEE Mains 2023 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : $\alpha$-halocarboxylic acid on reaction with dil. $\mathrm{NH_3}$ gives good yield of $\alpha$-amino carboxylic acid whereas the yield of amines is very low when prepared from alkyl halides.

Reason (R) : Amino acids exist in zwitter ion form in aqueous medium.

In the light of the above statements, choose the correct answer from the options given below :

A

(A) is not correct but (R) is correct

B

(A) is correct but (R) is not correct

C

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

D

Both (A) and (R) are correct and (R) is the correct explanation of (A)

Question 66: Palette 66/176

JEE Mains 2023 MCQ

The correct representation in six membered pyranose form for the following sugar [X] is

A

B

C

D

Question 67: Palette 67/176

JEE Mains 2023 MCQ

Match List I with List II

	List I		List II
	Test		Functional group / Class of Compound
A.	Molisch's Test	I.	Peptide
B.	Biuret Test	II.	Carbohydrate
C.	Carbylamine Test	III.	Primary amine
D.	Schiff's Test	IV.	Aldehyde

Choose the correct answer from the options given below :

A

(A) - III, (B) - IV, (C) - II, (D) - I

B

(A) - II, (B) - I, (C) - III, (D) - IV

C

(A) - III, (B) - IV, (C) - I, (D) - II

D

(A) - I, (B) - II, (C) - III, (D) - IV

Question 68: Palette 68/176

JEE Mains 2023 MCQ

A protein '$\mathrm{X}$' with molecular weight of $70,000 \mathrm{~u}$, on hydrolysis gives amino acids. One of these amino acid is

A

B

C

D

Question 69: Palette 69/176

JEE Mains 2023 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Ketoses give Seliwanoff's test faster than Aldoses.

Reason (R) : Ketoses undergo $\beta$-elimination followed by formation of furfural.

In the light of the above statements, choose the correct answer from the options given below :

A

(A) is false but (R) is true

B

Both (A) and (R) are true but (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are true and (R) is the correct explanation of (A)

Question 70: Palette 70/176

JEE Mains 2023 MCQ

Following tetrapeptide can be represented as

(F, L, D, Y, I, Q, P are one letter codes for amino acids)

A

YQLF

B

FIQY

C

PLDY

D

FLDY

Question 71: Palette 71/176

JEE Mains 2023 MCQ

Number of cyclic tripeptides formed with 2 amino acids A and B is :

A

2

B

3

C

5

D

4

Question 72: Palette 72/176

JEE Mains 2023 MCQ

Match items of Row I with those of Row II.

Row I :

Row II :

(i) $\alpha$-$\mathrm{D}$-$(-)$-$\mathrm{Fructofuranose}$

(ii) $\beta$-D-$(-)$-Fructofuranose

(iii) $\alpha$-D-$(-)$ Glucopyranose

(iv) $\beta$-D-$(-)$-Glucopyranose

Correct match is

A

A $\to$ iii, B $\to$ iv, C $\to$ i, D $\to$ ii

B

A $\to$ iv, B $\to$ iii, C $\to$ i, D $\to$ ii

C

A $\to$ i, B $\to$ ii, C $\to$ iii, D $\to$ iv

D

A $\to$ iii, B $\to$ iv, C $\to$ ii, D $\to$ i

Question 73: Palette 73/176

JEE Mains 2022 MCQ

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Amylose is insoluble in water.

Reason R: Amylose is a long linear molecule with more than 200 glucose units.

In the light of the above statements, choose the correct answer from the options given below.

A

Both $\mathbf{A}$ and $\mathbf{R}$ are correct and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$.

B

Both $\mathbf{A}$ and $\mathbf{R}$ are correct but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$.

C

$\mathbf{A}$ is correct but $\mathbf{R}$ is not correct

D

$\mathbf{A}$ is not correct but $\mathbf{R}$ is correct.

Question 74: Palette 74/176

JEE Mains 2022 MCQ

The formulas of A and B for the following reaction sequence

are

A

$\mathrm{A}=\mathrm{C}_{7} \mathrm{H}_{14} \mathrm{O}_{8}, \quad \mathrm{~B}=\mathrm{C}_{6} \mathrm{H}_{14}$

B

$\mathrm{A}=\mathrm{C}_{7} \mathrm{H}_{13} \mathrm{O}_{7}, \quad \mathrm{~B}=\mathrm{C}_{7} \mathrm{H}_{14} \mathrm{O}$

C

$\mathrm{A}=\mathrm{C}_{7} \mathrm{H}_{12} \mathrm{O}_{8}, \quad \mathrm{~B}=\mathrm{C}_{6} \mathrm{H}_{14}$

D

$\mathrm{A}=\mathrm{C}_{7} \mathrm{H}_{14} \mathrm{O}_{8}, \quad \mathrm{~B}=\mathrm{C}_{6} \mathrm{H}_{14} \mathrm{O}_{6}$

Question 75: Palette 75/176

JEE Mains 2022 MCQ

For the below given cyclic hemiacetal (X), the correct pyranose structure is :

A

B

C

D

Question 76: Palette 76/176

JEE Mains 2022 MCQ

Match List - I with Match List - II.

	List - I		List - II
(A)	Glucose + HI	(I)	Gluconic acid
(B)	Glucose + Br$_2$ water	(II)	Glucose pentacetate
(C)	Glucose + acetic anhydride	(III)	Saccharic acid
(D)	Glucose + HNO$_3$	(IV)	Hexane

Choose the correct answer from the options given below:

A

(A) - (IV), (B) - (I), (C) -(II), (D) - (III)

B

(A) - (IV), (B) - (III), (C) -(II), (D) - (I)

C

(A) - (III), (B) - (I), (C) -(IV), (D) - (II)

D

(A) - (I), (B) - (III), (C) -(IV), (D) - (II)

Question 77: Palette 77/176

JEE Mains 2022 MCQ

A sugar 'X' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar 'X' is

A

Aldopentose

B

Aldotetrose

C

Oxalic acid

D

Ketotetrose

Question 78: Palette 78/176

JEE Mains 2022 MCQ

Animal starch is the other name of

A

amylose.

B

maltose.

C

glycogen.

D

amylopectin.

Question 79: Palette 79/176

JEE Mains 2022 MCQ

Which one of the following is a reducing sugar?

A

B

C

D

Question 80: Palette 80/176

JEE Mains 2022 MCQ

Glycosidic linkage between C₁ of $\alpha$-glucose and C₂ of $\beta$-fructose is found in

A

maltose

B

sucrose

C

lactose

D

amylose

Question 81: Palette 81/176

JEE Mains 2022 MCQ

During the denaturation of proteins, which of these structures will remain intact?

A

Primary

B

Secondary

C

Tertiary

D

Quaternary

Question 82: Palette 82/176

JEE Mains 2022 MCQ

The sugar produced after complete hydrolysis of DNA is

A

a pentose sugar.

B

a hexose sugar.

C

a polysaccharide.

D

a disaccharide.

Question 83: Palette 83/176

JEE Mains 2022 MCQ

The structure of protein that is unaffected by heating is

A

secondary structure

B

tertiary structure

C

primary structure

D

quaternary structure

Question 84: Palette 84/176

JEE Mains 2022 MCQ

Sugar moiety in DNA and RNA molecules respectively are

A

$\beta$-D-2-deoxyribose, $\beta$-D-deoxyribose.

B

$\beta$-D-2-deoxyribose, $\beta$-D-ribose

C

$\beta$-D-ribose, $\beta$-D-2-deoxyribose.

D

$\beta$-D-deoxyribose, $\beta$-D-2-deoxyribose.

Question 85: Palette 85/176

JEE Mains 2022 MCQ

When sugar 'X' is boiled with dilute H₂SO₄ in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with HNO₃ yields saccharic acid where as 'B' is laevorotatory. The compound 'X' is :

A

Maltose

B

Sucrose

C

Lactose

D

Starch

Question 86: Palette 86/176

JEE Mains 2022 MCQ

Stability of $\alpha$-Helix structure of proteins depends upon

A

dipolar interaction

B

H-bonding interaction

C

van der Waals forces

D

$\pi$-stacking interaction

Question 87: Palette 87/176

JEE Mains 2022 MCQ

Given below are two statements.

Statement I : Maltose has two $\alpha$-D-glucose units linked at C₁ and C₄ and is a reducing sugar.

Statement II : Maltose has two monosaccharides : $\alpha$-D-glucose and $\beta$-D-glucose linked at C₁ and C₆ and it is a non-reducing sugar.

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are true.

B

Both Statement I and Statement II are false.

C

Statement I is true but Statement II is false.

D

Statement I is false but Statement II is true.

Question 88: Palette 88/176

JEE Mains 2022 MCQ

L-isomer of a compound 'A' (C₄H₈O₄) gives a positive test with [Ag(NH₃)₂]⁺. Treatment of 'A' with acetic anhydride yields triacetate derivative. Compound 'A' produces an optically active compound (B) and an optically inactive compound (C) on treatment with bromine water and HNO₃ respectively. Compound (A) is :

A

B

C

D

Question 89: Palette 89/176

JEE Mains 2022 MCQ

Match List-I with List-II

	List - I Enzyne		List - II Conversion of
A.	Invertase	I.	Starch into maltose
B.	Zymase	II.	Maltose into glucose
C.	Diastase	III.	Glucose into ethanol
D.	Maltase	IV.	Cane sugar into glucose

Choose the most appropriate answer from the options given below :

A

A-III, B-IV, C-II, D-I

B

A-III, B-II, C-I, D-IV

C

A-IV, B-III, C-I, D-II

D

A-IV, B-II, C-III, D-I

Question 90: Palette 90/176

JEE Mains 2022 MCQ

Which one of the following is a water soluble vitamin, that is not excreted easily?

A

Vitamin B₂

B

Vitamin B₁

C

Vitamin B₆

D

Vitamin B₁₂

Question 91: Palette 91/176

JEE Mains 2022 MCQ

A polysaccharide 'X' on boiling with dil H₂SO₄ at 393 K under 2-3 atm pressure yields 'Y'. 'Y' on treatment with bromine water gives gluconic acid. 'X' contains $\beta$-glycosidic linkages only. Compound 'X' is :

A

starch

B

cellulose

C

amylose

D

amylopectin

Question 92: Palette 92/176

JEE Mains 2021 MCQ

Which of the following is not an example of fibrous protein?

A

Keratin

B

Albumin

C

Collagen

D

Myosin

Question 93: Palette 93/176

JEE Mains 2021 MCQ

Which one of the following compounds contains $\beta$-C₁-C₄ glycosidic linkage?

A

Lactose

B

Sucrose

C

Maltose

D

Amylose

Question 94: Palette 94/176

JEE Mains 2021 MCQ

Hydrolysis of sucrose gives :

A

$\alpha$-D-($-$)-Glucose and $\beta$-D-($-$)-Fructose

B

$\alpha$-D-(+)-Glucose and $\alpha$-D-($-$)-Fructose

C

$\alpha$-D-($-$)-Glucose and $\alpha$-D-(+)-Fructose

D

$\alpha$-D-(+)-Glucose and $\beta$-D-($-$)-Fructose

Question 95: Palette 95/176

JEE Mains 2021 MCQ

Out of following isomeric forms of uracil, which one is present in RNA?

A

B

C

D

Question 96: Palette 96/176

JEE Mains 2021 MCQ

Given below are two statements : one is labelled as Assertion (A) and other is labelled as Reason (R).

Assertion (A) : Sucrose is a disaccharide and a non-reducing sugar.

Reason (R) : Sucrose involves glycosidic linkage between C₁ of $\beta$-glucose and C₂ of $\alpha$-fructose.

Choose the most appropriate answer from the options given below :

A

Both (A) and (R) are true but (R) is not the true explanation of (A).

B

(A) is false but (R) is true.

C

(A) is true but (R) is false.

D

Both (A) and (R) are true and (R) is the true explanation of (A)

Question 97: Palette 97/176

JEE Mains 2021 MCQ

Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is :

A

Amylose

B

Sucrose

C

Maltose

D

Lactose

Question 98: Palette 98/176

JEE Mains 2021 MCQ

Which one among the following chemical tests is used to distinguish monosaccharide from disaccharide?

A

Seliwanoff's test

B

Iodine test

C

Barfoed test

D

Tollen's test

Question 99: Palette 99/176

JEE Mains 2021 MCQ

The compound 'A' is a complementary base of _______________ in DNA stands.

A

Uracil

B

Guanine

C

Adenine

D

Cytosine

Question 100: Palette 100/176

JEE Mains 2021 MCQ

Which one of the following is correct structure for cytosine?

A

B

C

D

Question 101: Palette 101/176

JEE Mains 2021 MCQ

The water soluble protein is :

A

Fibrin

B

Albumin

C

Myosin

D

Collagen

Question 102: Palette 102/176

JEE Mains 2021 MCQ

Thiamine and pyridoxine are also known respectively as :

A

Vitamin B₂ and Vitamin E

B

Vitamin E and Vitamin B₂

C

Vitamin B₆ and Vitamin B₂

D

Vitamin B₁ and Vitamin B₆

Question 103: Palette 103/176

JEE Mains 2021 MCQ

Which one of the following statements is not true about enzymes?

A

Enzymes are non-specific for a reaction and substrate.

B

Almost all enzymes are proteins.

C

Enzymes work as catalysts by lowering the activation energy of a biochemical reaction.

D

The action of enzymes is temperature and pH specific.

Question 104: Palette 104/176

JEE Mains 2021 MCQ

Identify the incorrect statement from the following

A

Amylose is a branched chain polymer of glucose

B

Starch is a polymer of $\alpha$-D glucose

C

$\beta$-Glycosidic linkage makes cellulose polymer

D

Glycogen is called as animal starch

Question 105: Palette 105/176

JEE Mains 2021 MCQ

Deficiency of vitamin K causes :

A

Cheilosis

B

Decrease in blood clotting time

C

Increase in blood clotting time

D

Increase in fragility of RBC's

Question 106: Palette 106/176

JEE Mains 2021 MCQ

A non-reducing sugar "A" hydrolyses to give two reducing mono saccharides. Sugar A is

A

Fructose

B

Galactose

C

Glucose

D

Sucrose

Question 107: Palette 107/176

JEE Mains 2021 MCQ

${C_{12}}{H_{22}}{O_{11}} + {H_2}O\buildrel {Enzyme\,A} \over \longrightarrow \mathop {{C_6}{H_{12}}{O_6}}\limits_{Glu\cos e} + \mathop {{C_6}{H_{12}}{O_6}}\limits_{Fructose} $

$\mathop {{C_6}{H_{12}}{O_6}}\limits_{Glu\cos e} \buildrel {Enzyme\,B} \over \longrightarrow 2{C_2}{H_5}OH + 2C{O_2}$

In the above reactions, the enzyme A and enzyme B respectively are :

A

Zymase and Invertase

B

Invertase and Amylase

C

Amylase and Invertase

D

Invertase and Zymase

Question 108: Palette 108/176

JEE Mains 2021 MCQ

Fructose is an example of :

A

Heptose

B

Pyranose

C

Ketohexose

D

Aldohexose

Question 109: Palette 109/176

JEE Mains 2021 MCQ

Which of the following is correct structure of tyrosine?

A

B

C

D

Question 110: Palette 110/176

JEE Mains 2021 MCQ

The secondary structure of protein is stabilised by:

A

Hydrogen bonding

B

glycosidic bond

C

Peptide bond

D

van der Waals forces

Question 111: Palette 111/176

JEE Mains 2021 MCQ

Which among the following pairs of Vitamins is stored in our body relatively for longer duration?

A

Thiamine and Vitamin A

B

Ascorbic acid and Vitamin D

C

Thiamine and Ascorbic acid

D

Vitamin A and Vitamin D

Question 112: Palette 112/176

JEE Mains 2021 MCQ

Match List - I with List - II.

	List - I		List - II
(a)	Sucrose	(i)	$\beta $-D-Galactose and $\beta $-D-Glucose
(b)	Lactose	(ii)	$\alpha $-D-Glucose and $\beta $-D-Fructose
(c)	Maltose	(iii)	$\alpha $-D-Glucose and $\alpha $-D-Glucose

Choose the correct answer from the options given below :

A

(a) $ \to $ (iii), (b) $ \to $ (ii), (c) $ \to $ (i)

B

(a) $ \to $ (i), (b) $ \to $ (iii), (c) $ \to $ (ii)

C

(a) $ \to $ (ii), (b) $ \to $ (i), (c) $ \to $ (iii)

D

(a) $ \to $ (iii), (b) $ \to $ (i), (c) $ \to $ (ii)

Question 113: Palette 113/176

JEE Mains 2021 MCQ

Which of the following vitamin is helpful in delaying the blood clotting?

A

Vitamin K

B

Vitamin C

C

Vitamin E

D

Vitamin B

Question 114: Palette 114/176

JEE Mains 2021 MCQ

Which of the following is correct structure of $\alpha$-anomer of maltose?

A

B

C

D

Question 115: Palette 115/176

JEE Mains 2021 MCQ

Which of the glycosidic linkage between galactose and glucose is present in lactose?

A

C-1 of galactose and C-6 of glucose

B

C-1 of glucose and C-6 of galactose

C

C-1 of galactose and C-4 of glucose

D

C-1 of glucose and C-4 of galactose

Question 116: Palette 116/176

JEE Mains 2021 MCQ

Match List - I and List - II.

	List I		List II
(a)	Valium	(i)	Antifertility drug
(b)	Morphine	(ii)	Pernicious anaemia
(c)	Norethindrone	(iii)	Analgesic
(d)	Vitamin ${B_{12}}$	(iv)	Tranquilizer

A

(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

B

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

C

(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

D

(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

Question 117: Palette 117/176

JEE Mains 2021 MCQ

Out of the following, which type of interaction is reponsible for the stabilisation of $\alpha $-helix structure of proteins ?

A

Covalent bonding

B

vander Waals forces

C

Ionic bonding

D

Hydrogen bonding

Question 118: Palette 118/176

JEE Mains 2020 MCQ

Which one of the following statements is not true?

A

Lactose contains $\alpha $-glycosidic linkage between C₁ of galactose and C₄ of glucose

B

Lactose is a reducing sugar and it gives Fehling’s test

C

On acid hydrolysis, lactose gives one molecule of D(+)-glucose and one molecule of D(+)-galactose

D

Lactose (C₁₁H₂₂O₁₁) is a disaccharide and it contains 8 hydroxyl groups

Question 119: Palette 119/176

JEE Mains 2020 MCQ

Which of the following is not an essential amino acid :

A

Valine

B

Leucine

C

Lysine

D

Tyrosine

Question 120: Palette 120/176

JEE Mains 2020 MCQ

Which of the following will react with CHCl₃ + alc. KOH?

A

Adenine and thymine

B

Thymine and proline

C

Adenine and lysine

D

Adenine and proline

Question 121: Palette 121/176

JEE Mains 2020 MCQ

What are the functional groups present in the structure of maltose?

A

One acetal and one ketal

B

One ketal and one hemiketal

C

Two acetals

D

One acetal and one hemiacetal

Question 122: Palette 122/176

JEE Mains 2020 MCQ

The correct observation in the following reactions is :

A

Formation of blue colour

B

Formation of violet colour

C

Formation of red colour

D

Gives no colour

Question 123: Palette 123/176

JEE Mains 2020 MCQ

Consider the following rections:

'x', 'y' and 'z' in these reactions are respectively.

A

5, 6, & 5

B

4, 5 & 5

C

4, 6 & 5

D

5, 4 & 5

Question 124: Palette 124/176

JEE Mains 2020 MCQ

Two monomers in maltose are :

A

$\alpha $-D-glucose and $\alpha $-D-galactose

B

$\alpha $-D-glucose and $\alpha $-D-Fructose

C

$\alpha $-D-glucose and $\alpha $-D-glucose

D

$\alpha $-D-glucose and $\beta $-D-glucose

Question 125: Palette 125/176

JEE Mains 2020 MCQ

Which of the following statement is not true for glucose?

A

Glucose gives Schiff's test for aldehyde

B

Glucosse reacts with hydroxylamine to form oxime

C

The pentaacetate of glucose does not react with hydroxylamine to give oxime

D

Glucose exists in two crystalline forms $\alpha $ and $\beta $

Question 126: Palette 126/176

JEE Mains 2020 MCQ

Which of the following statements is correct ?

A

Gluconic acid can from cyclic (acteal/hemiacetal) structure

B

Gluconic acid is a partial oxidation product of glucose

C

Gluconic acid is obtained by oxidation of glucose with (HNO₃)

D

Gluconic acid is a dicarboxylic acid.

Question 127: Palette 127/176

JEE Mains 2020 MCQ

Match the following :
(i) Riboflavin    (a) Beriberi
(ii) Thiamine    (b) Scurvy
(iii) Pyridoxine   (c) Cheliosis
(iv) Ascorbic acid    (d) Convulsions

A

(i)-(c), (ii)-(d), (iii)-(a), (iv)-(b)

B

(i)-(d), (ii)-(b), (iii)-(a), (iv)-(c)

C

(i)-c, (ii)-(a), (iii)-(d), (iv)-(b)

D

(i)-(a), (ii)-(d), (iii)-(c), (iv)-(b)

Question 128: Palette 128/176

JEE Mains 2019 MCQ

Which of the given statements is INCORRECT about glycogen?

A

It is a straight chain polymer similar to amylose

B

It is present in animal cells

C

It is present in some yeast and fungi

D

Only $\alpha $-linkages are present in the molecule

Question 129: Palette 129/176

JEE Mains 2019 MCQ

Which of the following statements is not true about RNA?

A

It controls the synthesis of protein

B

It is present in the nucleus of the cell

C

It usually does not replicate

D

It has always double stranded $\alpha $-helix structure

Question 130: Palette 130/176

JEE Mains 2019 MCQ

Glucose and Galactose are having identical configuration in all the positions except position

A

C–5

B

C–3

C

C–2

D

C–4

Question 131: Palette 131/176

JEE Mains 2019 MCQ

Number of stereo centers present in linear and cyclic structures of glucose are respectively :

A

4 & 4

B

4 & 5

C

5 & 4

D

5 & 5

Question 132: Palette 132/176

JEE Mains 2019 MCQ

Amylopectin is compound of :

A

$\alpha $-D-glucose, C₁ – C₄ and C₁ – C₆ linkages

B

$\beta $-D-glucose, C₁ – C₄ and C₂ – C₆ linkages

C

$\beta $-D-glucose, C₁ – C₄ and C₁ – C₆ linkages

D

$\alpha $-D-glucose, C₁ – C₄ and C₂ – C₆ linkages

Question 133: Palette 133/176

JEE Mains 2019 MCQ

The peptide that gives positive ceric ammonium nitrate and carbylamine tests is :

A

Ser-Lys

B

Asp-Gln

C

Gln-Asp

D

Lys-Asp

Question 134: Palette 134/176

JEE Mains 2019 MCQ

Which of the following statements is not true about sucrose?

A

The glycosidic linkage is present between C₁ of $\alpha $-glucose and C₁ of $\beta $-fructose

B

It is also named as invert sugar

C

It is a non reducing sugar

D

On hydrolysis, it produces glucose and fructose

Question 135: Palette 135/176

JEE Mains 2019 MCQ

Fructose and glucose can be distinguished by :

A

Barfoed's test

B

Fehling's test

C

Seliwanoff's test

D

Benedict's test

Question 136: Palette 136/176

JEE Mains 2019 MCQ

Maltose on treatment with dilute HCI gives :

A

D-Galactose

B

D-Glucose and D-Fructose

C

D-Glucose

D

D-Fructose

Question 137: Palette 137/176

JEE Mains 2019 MCQ

The correct structure of histidine in a strongly acidic solution (pH = 2) is -

A

B

C

D

Question 138: Palette 138/176

JEE Mains 2019 MCQ

The correct statement (s) among I to III with respect to potassium ions that are abundant within the cell fluid is /are
I. They activate many enzymes
II. They participate in the oxidation of glucose to produce ATP
III. Along with sodium ions they are responsible for the transmission of nerve signals

A

III only

B

I and II only

C

I and III only

D

I, II and III only

Question 139: Palette 139/176

JEE Mains 2019 MCQ

Among the following compounds most basic amino acid is -

A

Lysine

B

Asparagine

C

Histidine

D

Serine

Question 140: Palette 140/176

JEE Mains 2019 MCQ

The correct match between Item I and Item II is :

Item I		Item II
(A)	Ester test	(P)	Tyr
(B)	Carbylamine test	(Q)	Asp
(C)	Phthalein dye test	(R)	Ser
		(S)	Lys

A

(A)$ \to $(Q); (B)$ \to $(S); (C)$ \to $(P)

B

(A)$ \to $(R); (B)$ \to $(S); (C)$ \to $(Q)

C

(A)$ \to $(R); (B)$ \to $(Q); (C)$ \to $(P)

D

(A)$ \to $(Q); (B)$ \to $(S); (C)$ \to $(R)

Question 141: Palette 141/176

JEE Mains 2019 MCQ

Among the following compounds, which one is found in RNA ?

A

B

C

D

Question 142: Palette 142/176

JEE Mains 2019 MCQ

Which of the following tests cannot be used for identifying amino acids?

A

Ninhydrin test

B

Barfoed test

C

Xanthoproteic test

D

Biuret test

Question 143: Palette 143/176

JEE Mains 2019 MCQ

The correct structure of product 'P' in the following reactions is :

A

B

C

D

Question 144: Palette 144/176

JEE Mains 2019 MCQ

The correct sequence of amino acids present in the tripeptide given below is :

A

Val - Ser - Thr

B

Thr - Ser - Val

C

Leu - Ser - Thr

D

Thr - Ser - Leu

Question 145: Palette 145/176

JEE Mains 2019 MCQ

The increasing order of pka of the following amino acids in aqueous solution is :

Gly, Asp, Lys, Arg

A

Asp < Gly < Arg < Lys

B

Gly < Asp < Arg < Lys

C

Asp < Gly < Lys < Arg

D

Arg < Lys < Gly < Asp

Question 146: Palette 146/176

JEE Mains 2018 MCQ

Among the following, the incorrect statement is :

A

Maltose and lactose has 1, 4 - glycosidic linkage.

B

Sucrose and amylose has 1, 2 - glycosidic linkage

C

Cellulose and amylose has 1, 4 - glycosidic linkage.

D

Lactose contains $\beta $-D-galactose and $\beta $-D-glucose.

Question 147: Palette 147/176

JEE Mains 2018 MCQ

Glucose on prolonged heating with HI gives

A

6-iodohexanal

B

n-Hexane

C

1-Hexene

D

Hexanoic acid

Question 148: Palette 148/176

JEE Mains 2018 MCQ

The predominant form of histamine present in human blood is (pK_a, Histidine = 6.0)

A

B

C

D

Question 149: Palette 149/176

JEE Mains 2018 MCQ

The dipeptide, Gln-Gly, on treatment with CH₃COCl followed y aqueous work up gives :

A

B

C

D

Question 150: Palette 150/176

JEE Mains 2018 MCQ

Which of the following is the correct structure of Adenosine?

A

B

C

D

Question 151: Palette 151/176

JEE Mains 2017 MCQ

The incorrect statement among the following is :

A

$\alpha $-D-glucose and $\beta $-D-glucose are anomers.

B

$\alpha $-D-glucose and $\beta $-D-glucose are enantiomers.

C

Cellulose is a straight chain polysaccharide made up of only $\beta $-D-glucose units.

D

The penta acetate of glucose does not react with hydroxyl amine

Question 152: Palette 152/176

JEE Mains 2017 MCQ

Among the following, the essential amino acid is :

A

Alanine

B

Valine

C

Aspartic acid

D

Serine

Question 153: Palette 153/176

JEE Mains 2017 MCQ

Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution?

A

B

C

D

Question 154: Palette 154/176

JEE Mains 2016 MCQ

Observation of “Rhumann’s purple” is a confirmatory test for the presence of :

A

Reducing sugar

B

Cupric ion

C

Protein

D

Starch

Question 155: Palette 155/176

JEE Mains 2016 MCQ

Consider the following sequence for aspartic acid :


The pI (isoelectric point) of aspartic acid is :

A

1.88

B

3.65

C

5.74

D

2.77

Question 156: Palette 156/176

JEE Mains 2016 MCQ

Thiol group is present in :

A

Cytosine

B

Cystine

C

Cysteine

D

Methionine

Question 157: Palette 157/176

JEE Mains 2015 MCQ

Which of the vitamins given below is water soluble?

A

Vitamin D

B

Vitamin E

C

Vitamin K

D

Vitamin C

Question 158: Palette 158/176

JEE Mains 2014 MCQ

Which one of the following bases is not present in DNA?

A

Cytosine

B

Thymine

C

Quinoline

D

Adenine

Question 159: Palette 159/176

JEE Mains 2013 MCQ

Synthesis of each molecule of glucose in photosynthesis involves:

A

10 molecules of ATP

B

8 molecules of ATP

C

6 molecules of ATP

D

18 molecules of ATP

Question 160: Palette 160/176

JEE Mains 2012 MCQ

Which of the following compounds can be detected by Molisch’s test ?

A

Nitro compounds

B

Sugars

C

Amines

D

Primary alcohols

Question 161: Palette 161/176

JEE Mains 2012 MCQ

Which one of the following statements is correct ?

A

All amino acids except lysine are optically active

B

All amino acids are optically active

C

All amino acids except glycine are optically active

D

All amino acids except glutamic acid are optically active

Question 162: Palette 162/176

JEE Mains 2011 MCQ

The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA ?

A

2^nd

B

3^rd

C

4^th

D

1^st

Question 163: Palette 163/176

JEE Mains 2010 MCQ

Biuret test is not given by

A

carbohydrates

B

polypeptides

C

urea

D

proteins

Question 164: Palette 164/176

JEE Mains 2009 MCQ

The two functional groups present in a typical carbohydrate are

A

-OH and -COOH

B

-CHO and -COOH

C

> C = O and - OH

D

- OH and -CHO

Question 165: Palette 165/176

JEE Mains 2008 MCQ

$\alpha$-D-(+)-glucose and $\beta$-D-(+)-glucose are

A

conformers

B

epimers

C

anomers

D

enantiomers

Question 166: Palette 166/176

JEE Mains 2007 MCQ

The secondary structure of a protein refers to

A

$\alpha$-helical backbone

B

hydrophobic interactions

C

sequence of $\alpha$-amino acids

D

fixed configuration of the polypeptide backbone

Question 167: Palette 167/176

JEE Mains 2006 MCQ

The term anomers of glucose refers to

A

isomers of glucose that differ in configurations at carbons one and four (C-1 and C-4)

B

a mixture of (D)-glucose and (L)-glucose

C

enantiomers of glucose

D

isomers of glucose that differ in configuration at carbon one (C-1)

Question 168: Palette 168/176

JEE Mains 2006 MCQ

The pyrimidine bases present in DNA are

A

cytosine and adenine

B

cytosine and guanine

C

cytosine and thymine

D

cytosine and uracil

Question 169: Palette 169/176

JEE Mains 2005 MCQ

In both DNA and RNA, heterocyclic base and phosphate ester linkages are at-

A

$C_5^{'}$ and $C_2^{'}$ respectively of the sugar molecule

B

$C_2^{'}$ and $C_5^{'}$ respectively of the sugar molecule

C

$C_1^{'}$ and $C_5^{'}$ respectively of the sugar molecule

D

$C_5^{'}$ and $C_1^{'}$ respectively of the sugar molecule

Question 170: Palette 170/176

JEE Mains 2004 MCQ

Identify the correct statements regarding enzymes

A

Enzymes are specific biological catalysts that can normally function at very high temperature (T ~ 1000 K)

B

Enzymes are specific biological catalysts that the posses well – defined active sites

C

Enzymes are specific biological catalysts that can not be poisoned

D

Enzymes are normally heterogeneous catalysts that are very specific in their action

Question 171: Palette 171/176

JEE Mains 2004 MCQ

Which base is present in RNA but not in DNA?

A

Uracil

B

Thymine

C

Guanine

D

Cytosine

Question 172: Palette 172/176

JEE Mains 2004 MCQ

Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?

A

A co- enzyme

B

An antibiotic

C

An enzyme

D

A hormone

Question 173: Palette 173/176

JEE Mains 2003 MCQ

The reason for double helical structure of $DNA$ is operation of

A

dipole-dipole interaction

B

hydrogen bonding

C

electrostatic attractions

D

van der Waals' forces

Question 174: Palette 174/176

JEE Mains 2003 MCQ

Complete hydrolysis of cellulose gives

A

D-ribose

B

D-glucose

C

L-glucose

D

D-fructose

Question 175: Palette 175/176

JEE Mains 2002 MCQ

The functional group, which is found in amino acid is

A

-COOH group

B

-NH₂ group

C

-CH₃ group

D

both (a) and (b)

Question 176: Palette 176/176

JEE Mains 2002 MCQ

RNA is different from DNA because RNA contains

A

ribose sugar and thymine

B

ribose sugar and uracil

C

deoxyribose sugar and thymine

D

deoxyribose sugar and uracil