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JEE Advanced

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

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Q 1. The pair of compounds showing positive Tollens reagent test is

A

glucose and sucrose

B

fructose and sucrose

glucose and fructose

D

acetophenone and pentanal

Explanation

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Q 2. In addition to an aldehyde group, glucose contains:

A

One secondary and four primary OH groups

One primary and four secondary OH groups

C

Two primary OH and three secondary OH groups

D

Three primary OH and two secondary OH groups

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Q 3. At {tex} \mathrm { pH } = 4 , {/tex} glycine exists as:

A

C

D

Explanation

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Q 4. The efficiency of an enzyme to catalyze a reaction is due to its capacity to:

Reduce the activation energy of the reaction

B

Form strong enzyme-substrate complex

C

Decrease the bond energies of all the substrate molecules

D

Increase the free energy of the catalyst-substrate reaction

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Q 5. Glucose reacts with excess of phenylhydrazine and forms

Glucosazone

B

Glucose phenylhydrazone

C

Glucose oxime

D

Sorbitol

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Q 6. The number of tripeptides formed by three different amino acids is:

A

Three

B

Four

C

Five

Six

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Q 7. The term anomer of glucose refers to:

A

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

B

A mixture of D-glucose and L-glucose

C

Enantiomers of glucose

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

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Q 8. Which of the following pairs give positive Tollen's test?

A

Glucose, sucrose

Glucose, fructose

C

Hexanal, acetophenone

D

Fructose, sucrose

Explanation

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Q 9. Vitamin {tex} \mathrm { B } _ { 1 } {/tex} is:

A

Riboflavin

B

Cobalamin

Thiamine

D

Pyridoxine

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Q 10. Glucose molecule reacts with {tex} X {/tex} number of molecules of phenylhydrazine to yield osazone. The value of {tex} X {/tex} is:

Three

B

Two

C

One

D

Four

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Q 11.

The correct statement about the following disccharide is

Ring (a) is pyranose with glycosidic link

B

Ring (a) is furanose with glycosidic link

C

Ring (b) is furanose with glycosidic link

D

Ring (b) is pyranose with glycosidic link

Explanation

Ring is pyranose (6 membered ring containing one O-atom) with glycosidic linkage and ring is furanose with glycosidic linkage.

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Q 12.

The pH value of the solution in which a particular amino acid does not migrate under the influence of an electric field is called the:

A

Eutectic point

B

Neutralisation point

C

Effusion point

Isoelectric point

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Q 13.

The chemical extracted from the plant Rauwolfia serpentine is:

A

Aspirin

B

Quinine

C

Bithional

Reserpine

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Q 14.

Among the following the achiral amino acid is:

A

Ethylalanine

B

Methylglycine

2-Hydroxymethylserine

D

Tryptophan

Explanation

It does not contain a chiral centre

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Q 15.

Which of the following biomolcules is insoluble in water?

-Keratin

B

Haemoglobin

C

Ribonuclease

D

Adenine

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Q 16.

The chemical substance which acts as emulsifier is:

A

Phosphoric acid

B

Fatty acid

Bile acids

D

Mineral acids (HCl)

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Q 17.

Mark the incorrect statement about ATP

A

It is a nucleotide

B

It contains the purine adenine

The enzyme-catalysed hydrolysis of ATP to ADP and AMP is accompanied by absorption of energy

D

Energy is stored in the cell in the form of ATP

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Q 18.

Which of the following statements is incorrect?

-D-glucose and -D-glucose are enantiomers

B

D-Glyceraldehyde and L-glyceraldehyde are epimers

C

The reserve carbohydrate of animals is glycogen

D

Few aldohexoses which react with phenylhydrazine to give identical osazones are epimers

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Q 19.

In addition to an aldehyde group, glucose contains:

A

One secondary and four primary OH groups

One primary and four secondary OH groups

C

Two primary OH and three secondary OH groups

D

Three primary OH and two secondary OH groups

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Q 20.

Thymine is:

5-Methyluracil

B

4-Methyluracil

C

3-Methyluracil

D

1-Methyluracil

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Q 21.

Which of the following carbohydrates cannot be directly utilised by the human body as a source of energy?

A

Glucose

B

Sucrose

C

Glycogen

Cellulose

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Q 22.

Which base is present in RNA but not in DNA?

Uracil

B

Cytosine

C

Guanine

D

Thymine

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Q 23.

The human body does not produce:

A

Enzymes

B

DNA

Vitamins

D

Hormones

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Q 24.

During aerobic respiration, one molecule of glucose produces:

A

2 ATP molecules

B

50 ATP molecules

38 ATP molecules

D

36 ATP molecules

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Q 25.

- and -Glucose differ in the orientation of the group around:

B

C

D