Biomolecules
200 Questions
Start JEE Mains Test
2020
Q151
JEE Mains
Numerical
14 Mar 2026
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
Q152
JEE Mains
MCQ
14 Mar 2026
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
Q153
JEE Mains
MCQ
14 Mar 2026
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
Q154
JEE Mains
MCQ
14 Mar 2026
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
Q155
JEE Mains
MCQ
14 Mar 2026
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
Q156
JEE Mains
MCQ
14 Mar 2026
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
Q157
JEE Mains
MCQ
14 Mar 2026
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
Q158
JEE Mains
MCQ
14 Mar 2026
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 $-fructose
B.
It is also named as invert sugar
C.
It is a non reducing sugar
D.
On hydrolysis, it produces glucose and
fructose
2019
Q159
JEE Mains
MCQ
14 Mar 2026
Fructose and glucose can be distinguished by :
A.
Barfoed's test
B.
Fehling's test
C.
Seliwanoff's test
D.
Benedict's test
2019
Q160
JEE Mains
MCQ
14 Mar 2026
Maltose on treatment with dilute HCI gives :
A.
D-Galactose
B.
D-Glucose and D-Fructose
C.
D-Glucose
D.
D-Fructose
2019
Q161
JEE Mains
MCQ
14 Mar 2026
The correct structure of histidine in a strongly acidic solution (pH = 2) is -
A.
B.
C.
D.
2019
Q162
JEE Mains
MCQ
14 Mar 2026
The correct statement (s) among I to III with respect to potassium ions that are abundant within the cell fluid
is /are
I. They activate many enzymes
II. They participate in the oxidation of glucose to produce ATP
III. Along with sodium ions they are responsible for the transmission of nerve signals
I. They activate many enzymes
II. They participate in the oxidation of glucose to produce ATP
III. Along with sodium ions they are responsible for the transmission of nerve signals
A.
III only
B.
I and II only
C.
I and III only
D.
I, II and III only
2019
Q163
JEE Mains
MCQ
14 Mar 2026
Among the following compounds most basic amino acid is -
A.
Lysine
B.
Asparagine
C.
Histidine
D.
Serine
2019
Q164
JEE Mains
MCQ
14 Mar 2026
The correct match between Item I and Item II is :
| Item I | Item II | ||
|---|---|---|---|
| (A) | Ester test | (P) | Tyr |
| (B) | Carbylamine test | (Q) | Asp |
| (C) | Phthalein dye test |
(R) | Ser |
| (S) | Lys | ||
A.
(A)$ \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)
2019
Q165
JEE Mains
MCQ
14 Mar 2026
Among the following compounds, which one is found in RNA ?
A.
B.
C.
D.
2019
Q166
JEE Mains
MCQ
14 Mar 2026
Which of the following tests cannot be used for identifying amino acids?
A.
Ninhydrin test
B.
Barfoed test
C.
Xanthoproteic test
D.
Biuret test
2019
Q167
JEE Mains
MCQ
14 Mar 2026
The correct structure of product 'P' in the following reactions is :
A.
B.
C.
D.
2019
Q168
JEE Mains
MCQ
14 Mar 2026
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
2019
Q169
JEE Mains
MCQ
14 Mar 2026
The increasing order of pka of the following amino acids in aqueous solution is :
Gly, Asp, Lys, Arg
Gly, Asp, Lys, Arg
A.
Asp < Gly < Arg < Lys
B.
Gly < Asp < Arg < Lys
C.
Asp < Gly < Lys < Arg
D.
Arg < Lys < Gly < Asp
2018
Q170
JEE Mains
MCQ
14 Mar 2026
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.
2018
Q171
JEE Mains
MCQ
14 Mar 2026
Glucose on prolonged heating with HI gives
A.
6-iodohexanal
B.
n-Hexane
C.
1-Hexene
D.
Hexanoic acid
2018
Q172
JEE Mains
MCQ
14 Mar 2026
The predominant form of histamine present in human blood is (pKa, Histidine = 6.0)
A.
B.
C.
D.
2018
Q173
JEE Mains
MCQ
14 Mar 2026
The dipeptide, Gln-Gly, on treatment with CH3COCl followed y aqueous work up gives :
A.
B.
C.
D.
2018
Q174
JEE Mains
MCQ
14 Mar 2026
Which of the following is the correct structure of Adenosine?
A.
B.
C.
D.
2017
Q175
JEE Mains
MCQ
14 Mar 2026
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
2017
Q176
JEE Mains
MCQ
14 Mar 2026
Among the following, the essential amino acid is :
A.
Alanine
B.
Valine
C.
Aspartic acid
D.
Serine
2017
Q177
JEE Mains
MCQ
14 Mar 2026
Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution?
A.
B.
C.
D.
2016
Q178
JEE Mains
MCQ
14 Mar 2026
Observation of “Rhumann’s purple” is a confirmatory test for the presence of :
A.
Reducing sugar
B.
Cupric ion
C.
Protein
D.
Starch
2016
Q179
JEE Mains
MCQ
14 Mar 2026
Consider the following sequence for aspartic acid :
The pI (isoelectric point) of aspartic acid is :
The pI (isoelectric point) of aspartic acid is :
A.
1.88
B.
3.65
C.
5.74
D.
2.77
2016
Q180
JEE Mains
MCQ
14 Mar 2026
Thiol group is present in :
A.
Cytosine
B.
Cystine
C.
Cysteine
D.
Methionine
2015
Q181
JEE Mains
MCQ
14 Mar 2026
Which of the vitamins given below is water soluble?
A.
Vitamin D
B.
Vitamin E
C.
Vitamin K
D.
Vitamin C
2014
Q182
JEE Mains
MCQ
14 Mar 2026
Which one of the following bases is not present in DNA?
A.
Cytosine
B.
Thymine
C.
Quinoline
D.
Adenine
2013
Q183
JEE Mains
MCQ
14 Mar 2026
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
2012
Q184
JEE Mains
MCQ
14 Mar 2026
Which of the following compounds can be detected by Molisch’s test ?
A.
Nitro compounds
B.
Sugars
C.
Amines
D.
Primary alcohols
2012
Q185
JEE Mains
MCQ
14 Mar 2026
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
2011
Q186
JEE Mains
MCQ
14 Mar 2026
The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA ?
A.
2nd
B.
3rd
C.
4th
D.
1st
2010
Q187
JEE Mains
MCQ
14 Mar 2026
Biuret test is not given by
A.
carbohydrates
B.
polypeptides
C.
urea
D.
proteins
2009
Q188
JEE Mains
MCQ
14 Mar 2026
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
2008
Q189
JEE Mains
MCQ
14 Mar 2026
$\alpha$-D-(+)-glucose and $\beta$-D-(+)-glucose are
A.
conformers
B.
epimers
C.
anomers
D.
enantiomers
2007
Q190
JEE Mains
MCQ
14 Mar 2026
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
2006
Q191
JEE Mains
MCQ
14 Mar 2026
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)
2006
Q192
JEE Mains
MCQ
14 Mar 2026
The pyrimidine bases present in DNA are
A.
cytosine and adenine
B.
cytosine and guanine
C.
cytosine and thymine
D.
cytosine and uracil
2005
Q193
JEE Mains
MCQ
14 Mar 2026
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
2004
Q194
JEE Mains
MCQ
14 Mar 2026
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
2004
Q195
JEE Mains
MCQ
14 Mar 2026
Which base is present in RNA but not in DNA?
A.
Uracil
B.
Thymine
C.
Guanine
D.
Cytosine
2004
Q196
JEE Mains
MCQ
14 Mar 2026
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
2003
Q197
JEE Mains
MCQ
14 Mar 2026
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
2003
Q198
JEE Mains
MCQ
14 Mar 2026
Complete hydrolysis of cellulose gives
A.
D-ribose
B.
D-glucose
C.
L-glucose
D.
D-fructose
2002
Q199
JEE Mains
MCQ
14 Mar 2026
The functional group, which is found in amino acid is
A.
-COOH group
B.
-NH2 group
C.
-CH3 group
D.
both (a) and (b)
2002
Q200
JEE Mains
MCQ
14 Mar 2026
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