2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th August Evening Shift
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
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th August Morning Shift
Out of following isomeric forms of uracil, which one is present in RNA?
A.
B.
C.
D.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th August Evening Shift
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 :
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)
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th July Evening Shift
Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is :
A.
Amylose
B.
Sucrose
C.
Maltose
D.
Lactose
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th July Morning Shift
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
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th July Morning Shift
The compound 'A' is a complementary base of _______________ in DNA stands.
A.
Uracil
B.
Guanine
C.
Adenine
D.
Cytosine
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th July Evening Shift
Which one of the following is correct structure for cytosine?
A.
B.
C.
D.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th July Morning Shift
The water soluble protein is :
A.
Fibrin
B.
Albumin
C.
Myosin
D.
Collagen
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 22th July Evening Shift
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
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Evening Shift
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.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Morning Shift
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
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 18th March Evening Shift
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
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 18th March Morning Shift
A non-reducing sugar "A" hydrolyses to give two reducing mono saccharides. Sugar A is
A.
Fructose
B.
Galactose
C.
Glucose
D.
Sucrose
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Evening Shift
${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 :
$\mathop {{C_6}{H_{12}}{O_6}}\limits_{Glu\cos e} \buildrel {Enzyme\,B} \over \longrightarrow 2{C_2}{H_5}OH + 2C{O_2}$
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
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Evening Shift
Fructose is an example of :
A.
Heptose
B.
Pyranose
C.
Ketohexose
D.
Aldohexose
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Morning Shift
Which of the following is correct structure of tyrosine?
A.
B.
C.
D.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Evening Shift
The secondary structure of protein is stabilised by:
A.
Hydrogen bonding
B.
glycosidic bond
C.
Peptide bond
D.
van der Waals forces
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Morning Shift
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
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th February Evening Shift
Match List - I with List - II.
Choose the correct answer from the options given below :
| 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)
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th February Morning Shift
Which of the following vitamin is helpful in delaying the blood clotting?
A.
Vitamin K
B.
Vitamin C
C.
Vitamin E
D.
Vitamin B
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Evening Shift
Which of the following is correct structure of $\alpha$-anomer of maltose?
A.
B.
C.
D.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Morning Shift
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
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Evening Shift
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)
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Morning Shift
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
2021
JEE Mains
Numerical
JEE Main 2021 (Online) 1st September Evening Shift
A peptide synthesized by the reactions of one molecule each of Glycine, Leucine, Aspartic acid and Histidine will have _________ peptide linkages.
Correct Answer: 3
Explanation:
Combination of n amino acids gives a polypeptide
with (n – 1) peptide linkages.
Similarly combination of four amino acids gives a tetrapeptide with three peptide linkages.
Similarly combination of four amino acids gives a tetrapeptide with three peptide linkages.
2021
JEE Mains
Numerical
JEE Main 2021 (Online) 26th August Morning Shift
The total number of negative charge in the tetrapeptide, Gly-Glu-Asp-Tyr, at pH 12.5 will be ______________. (Integer answer)
Correct Answer: 4
Explanation:
Total negative charge produced = 4.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 6th September Evening Slot
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
Lactose contains $\beta $-glycosidic linkage between C1
of galactose and C4
of glucose.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 5th September Morning Slot
Which of the following is not an essential
amino acid :
A.
Valine
B.
Leucine
C.
Lysine
D.
Tyrosine
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 4th September Morning Slot
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
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 4th September Morning Slot
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
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 2nd September Evening Slot
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
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 2nd September Morning Slot
Consider the following rections:
'x', 'y' and 'z' in these reactions are respectively.
'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
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 8th January Evening Slot
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
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 8th January Morning Slot
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 $
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 7th January Evening Slot
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.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 7th January Morning Slot
Match the following :
(i) Riboflavin (a) Beriberi
(ii) Thiamine (b) Scurvy
(iii) Pyridoxine (c) Cheliosis
(iv) Ascorbic acid (d) Convulsions
(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)
2020
JEE Mains
Numerical
JEE Main 2020 (Online) 5th September Evening Slot
The number of chiral carbons present in
sucrose is _____.
Correct Answer: 9
Explanation:
Total number of chiral carbon in sucrose = 9
2020
JEE Mains
Numerical
JEE Main 2020 (Online) 5th September Morning Slot
The number of chiral carbon(s) present in
peptide, Ile-Arg-Pro, is _____.
peptide, Ile-Arg-Pro, is _____.
Correct Answer: 4
Explanation:
The amino acids present in the given tripeptide
I$l$e–Arg–Pro are isoleucine, arginine and proline.
Number of chiral carbons present in the given tripeptide is 4.
Number of chiral carbons present in the given tripeptide is 4.
2020
JEE Mains
Numerical
JEE Main 2020 (Online) 4th September Evening Slot
The number of chiral centres present in
threonine is ________.
Correct Answer: 2
Explanation:
The structure of threonine is
No. of chiral centres present in it = 2
No. of chiral centres present in it = 2
2020
JEE Mains
Numerical
JEE Main 2020 (Online) 3rd September Evening Slot
The number of 
groups present in a tripeptide Asp–Glu–Lys is ____.
groups present in a tripeptide Asp–Glu–Lys is ____.
Correct Answer: 5
Explanation:
Structure of Tripeptide Asp – Glu – Lys
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th April Evening Slot
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
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th April Morning Slot
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
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th April Morning Slot
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
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 10th April Evening Slot
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
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 10th April Morning Slot
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
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 9th April Evening Slot
The peptide that gives positive ceric
ammonium nitrate and carbylamine tests is :
A.
Ser-Lys
B.
Asp-Gln
C.
Gln-Asp
D.
Lys-Asp
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 9th April Morning Slot
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
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 8th April Evening Slot
Fructose and glucose can be distinguished by :
A.
Barfoed's test
B.
Fehling's test
C.
Seliwanoff's test
D.
Benedict's test
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 8th April Morning Slot
Maltose on treatment with dilute HCI gives :
A.
D-Galactose
B.
D-Glucose and D-Fructose
C.
D-Glucose
D.
D-Fructose
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th January Evening Slot
The correct structure of histidine in a strongly acidic solution (pH = 2) is -
A.
B.
C.
D.
