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JEE Main

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

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Q 1. Which compound can exist in a dipolar (zwitter ion) structure?

A

{tex} \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CH } _ { 2 } \mathrm { CH } \left( \mathrm { N } = \mathrm { CH } _ { 2 } \right) \mathrm { COOH } {/tex}

{tex} \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCH } \left( \mathrm { NH } _ { 2 } \right) \mathrm { COOH } {/tex}

C

{tex} \mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CONHCH } _ { 2 } \mathrm { COOH } {/tex}

D

{tex}\mathrm {HOOCCH_2CH_2COCOOH}{/tex}

Explanation



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Q 2. Which of the following biomolecules is insoluble water?

{tex}\alpha {/tex}-keratin

B

Haemoglobin

C

Ribonuclease

D

Adenine

Explanation

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Q 3. Vitamin {tex} \mathrm { B } _ { 1 } {/tex} is also known as:

A

ascorbic acid

B

riboflavin

C

pyridoxine

thiamine

Explanation

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Q 4. The glycosidic linkage involved in the linking of the glucose units in amylase part of starch is

A

{tex} \mathrm { C } _ { 1 } - \mathrm { C } _ { 4 } \beta {/tex} -linkage

B

{tex} \mathrm { C } _ { 1 } - \mathrm { C } _ { 6}{/tex} {tex} \alpha - {/tex} linkage

{tex} \mathrm { C } _ { 1 } - \mathrm { C } _ { 4 }{/tex} {tex} \alpha - {/tex} linkage

D

{tex} \mathrm { C } _ { 1 } - \mathrm { C } _ { 6 }{/tex} {tex} \beta - {/tex} linkage

Explanation

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Q 5. An {tex} \alpha {/tex} -helix is a structure feature of:

Polypeptides

B

Polyethylene

C

Cellulose

D

Rubber

Explanation

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Q 6. RNA and DNA are chiral molecules, their chirality is due to:

D-sugar compound

B

L-sugar component

C

chiral bases

D

Chiral phosphate ester groups

Explanation

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Q 7. Ribose and 2-deoxyribose can be differentiated by

A

Fehling's reagent

B

Tollen's reagent

Osazone formation

D

Barfoed's reagent

Explanation

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Q 8. The correct structure of the dipeptide gly-ala is

A

B

D

Explanation