JEE Main > Biomolecules

Explore popular questions from Biomolecules for JEE Main. This collection covers Biomolecules previous year JEE Main questions hand picked by popular teachers.


Q 1.    

Correct4

Incorrect-1

{tex}\mathrm{RNA}{/tex} is different from {tex}\mathrm{DNA}{/tex} because {tex}\mathrm{RNA}{/tex} contains

A

ribose sugar and thymine

ribose sugar and uracil

C

deoxyribose sugar and thymine

D

deoxyribose sugar and uracil.

Explanation

Q 2.    

Correct4

Incorrect-1

The functional group, which is found in amino acid is

A

{tex} - \mathrm { COOH } {/tex} group

B

{tex} - \mathrm { NH } _ { 2 } {/tex} group

C

{tex} - \mathrm { CH } _ { 3 } {/tex} group

both (a) and (b).

Explanation


Q 3.    

Correct4

Incorrect-1

Complete hydrolysis of cellulose gives

A

D-fructose

B

D-ribose

D-glucose

D

L-glucose.

Explanation


Q 4.    

Correct4

Incorrect-1

The reason for double helical structure of {tex}\mathrm{DNA}{/tex} is operation of

A

van der Waal's forces

B

dipole-dipole interaction

hydrogen bonding

D

electrostatic attractions.

Explanation


Q 5.    

Correct4

Incorrect-1

Identify the correct statement regarding enzymes.

A

Enzymes are specific biological catalysts that can normally function at very high temperatures {tex} ( T \sim 1000 \mathrm { K } ) {/tex}.

B

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

C

Enzymes are specific biological catalysts that cannot be poisoned.

Enzymes are specific biological catalysts that possess well-defined active sites.

Explanation


Q 6.    

Correct4

Incorrect-1

Which base is present in {tex}\mathrm{RNA}{/tex} but not in {tex}\mathrm{DNA}{/tex}?

Uracil

B

Cytosine

C

Guanine

D

Thymine

Explanation


Q 7.    

Correct4

Incorrect-1

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

A hormone

C

An enzyme

D

An antibiotic.

Explanation


Q 8.    

Correct4

Incorrect-1

In both {tex}\mathrm{DNA}{/tex} and {tex}\mathrm{RNA}{/tex}, heterocyclic base and phosphate ester linkages are at

A

{tex} \mathrm { C } _ { 5 } ^ { \prime } {/tex} and {tex} \mathrm { C } _ { 2 } ^ { \prime } {/tex} respectively of the sugar molecule

B

{tex} \mathrm { C } _ { 2 } ^ { \prime } {/tex} and {tex} \mathrm { C } _ { 5 } ^ { \prime } {/tex} respectively of the sugar molecule

{tex} \mathrm { C } _ { 1 } ^ { \prime } {/tex} and {tex} \mathrm { C } _ { 5 } ^ { \prime } {/tex} respectively of the sugar molecule

D

{tex} \mathrm { C } _ { 5 } ^ { \prime } {/tex} and {tex} \mathrm { C } _ { 1 } ^ { \prime } {/tex} respectively of the sugar molecule

Explanation

Q 9.    

Correct4

Incorrect-1

The term anomers of glucose refers to

A

isomers of glucose that differ in configurations at carbons one and four {tex} ( \mathrm { C } - 1 \text { and } \mathrm { C } - 4 ) {/tex}

B

a mixture of {tex}(\mathrm D){/tex}-glucose and {tex}(\mathrm L){/tex}-glucose

C

enantiomers of glucose

isomers of glucose that differ in configuration at carbon one {tex} ( \mathrm { C } - 1 ) {/tex}.

Explanation



Q 10.    

Correct4

Incorrect-1

The pyrimidine bases present in {tex}\mathrm{DNA}{/tex} are

A

cytosine and adenine

B

cytosine and guanine

cytosine and thymine

D

cytosine and uracil.

Explanation


Q 11.    

Correct4

Incorrect-1

The secondary structure of a protein refers to

A

fixed configuration of the polypeptide backbone

{tex}\alpha{/tex}-helical backbone

C

hydrophobic interactions

D

sequence of {tex} \alpha {/tex} -amino acids.

Explanation



Q 12.    

Correct4

Incorrect-1

{tex} \alpha -D - ( + ) - {/tex} glucose and {tex} \beta - D - ( + ) - {/tex} glucose are

A

enantiomers

B

conformers

C

epimers

anomers

Explanation



Q 13.    

Correct4

Incorrect-1

The change in optical rotation, with time, of freshly prepared solution of sugar is known as

A

Rotatory motion

B

Inversion

C

Specific rotation

Mutarotation

Explanation

Q 14.    

Correct4

Incorrect-1

Gun-cotton is

A

Nitrosucrose

Nitrocellulose

C

Nitroglucose

D

Nitropicrin

Explanation

Q 15.    

Correct4

Incorrect-1

Which of the following monosaccharide is a pentose

A

Galactose

B

Glucose

C

Fructose

Arabinose

Explanation

Q 16.    

Correct4

Incorrect-1

Amide group is present in

A

Lipids

B

Carbohydrates

C

Amino acids

Proteins

Explanation

Q 17.    

Correct4

Incorrect-1

Which of the following is a carbohydrate

A

Leucine

B

Albumin

lnulin

D

Maltase

Explanation

Q 18.    

Correct4

Incorrect-1

General formula for carbohydrates is

A

{tex} C _ { n } H _ { 2 n } O _ { 2 n + 2 } {/tex}

B

{tex} C _ { x } \left( H _ { 2 } O \right) _ { 2 x } {/tex}

{tex} C _ { x } \left( H _ { 2 } O \right) _ { y } {/tex}

D

None of these

Explanation

Q 19.    

Correct4

Incorrect-1

Benedict solution provides

A

{tex} A g ^ { + } {/tex}

B

{tex} L i ^ { + } {/tex}

{tex} C u ^ { + 2 } {/tex}

D

{tex} B a ^ { + 2 } {/tex}

Explanation

Q 20.    

Correct4

Incorrect-1

Glucose gives silver mirror with Tollen's reagent. It shows the presence of

A

An acidic group

B

An alcoholic group

C

A ketonic group

An aldehydic group

Explanation

Q 21.    

Correct4

Incorrect-1

A certain compound gives negative test with ninhydrin and positive test with Benedict's solution. The compound is

A

A protein

A monosaccharide

C

A lipid

D

An amino acid

Explanation

Q 22.    

Correct4

Incorrect-1

An organic compound answers Molisch's test as well as Benedict'stest. But it does not answer Scliwanoff's test. Most probably, it is

A

Sucrose

B

Protein

C

Fructose

Maltose

Explanation

Q 23.    

Correct4

Incorrect-1

Glucose when heated with {tex} C H _ { 3 } O H {/tex} in presence of dry {tex} H Cl {/tex} gas gives {tex} \alpha {/tex} and {tex} \beta - {/tex} methyl glucosides because it contains

A

An aldehyde group

B

{tex} \mathrm { A } - \mathrm { CH } _ { 2 } \mathrm { OH } {/tex} group

A ring structure

D

Five hydroxyl groups

Explanation


Q 24.    

Correct4

Incorrect-1

Which one is a disaccharide

A

Glucose

B

Fructose

C

Xylose

Sucrose

Explanation

Q 25.    

Correct4

Incorrect-1

Molecular formula {tex} C _ { 6 } H _ { 12 } O _ { 6 } {/tex} is of

A

Glucose

B

Fructose

Both (a) and (b)

D

None of these

Explanation