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Biomolecules MCQs for NEET — Zoology Questions with Answers

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Which amino acid does not contain chiral centre ?

Valine

Leucine

Glycine

Iso-leucine

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Explanation

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A D-carbohydrate is :

Always dextrorotatory

Always laevorotatory

Always the mirror of the corresponding L-carbohydrate

None of these

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For the complex conversion of D-glucose into the corresponding osazone, the minimum number of equivalents of phenyl hydrazine required is :

two

three

four

five

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Which reagent/s can be used to distinguish glucose and fructose?

(I) Bromine water (II) Tollen’s reagent (III) Schiff’s reagent

(I), (II) and (III)

(II) and (III)

(I) & (II)

Only (Ill)

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Proteins mainly contain:

C, H, O and N

only C and H

C, H and O

N and H

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Explanation

(a) Proteins are made up of amino acids which contains-COOH gp. and NH₂ gp.

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In human body enzymes hydrolyse protein into:

a ketonic acid like CH₃COCOOH

a hydroxy acid like CH₃CHOHCOOH

dicarboxylic acid like HOOC—COOH

amino acid like CH₂NH₂COOH

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Explanation

(d) Proteins $\to_{enzyme}^{Hydrolytic}$ Amino acids.

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Which statement about protein is wrong?

Proteins occur in all living cells

Proteins invariably contain N, O, C and H

Proteins are synthesized by plant kingdom only

Proteins are also synthesized in laboratory

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Explanation

(c)

Proteins are synthesized by the plant kingdom as well by the animal kingdom. Hence The option c is incorrect.

Short-Proteins can be synthesized in the laboratory by many synthetic methods hence it is the correct answer

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Which of the following contains the highest percentage of protein?

Groundnut

Cow’s milk

Egg

Wheat

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Explanation

(a) It is a fact.

groundnut contain 25% protein ,whereas egg contain 13%

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The main structural feature of protein is:

the ester linkage

the ether linkage

the peptide linkage

all of these

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Explanation

The main structural feature of proteins is the peptide linkage. Proteins are polypeptides composed of amino acids linked together by peptide bonds, which are amide linkages formed by the condensation of an amino group and a carboxyl group.

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Proteins give ?

a violet colour with alkaline CuSO₄ solution

form a purple colour on boiling with dilute ninhydrin solution

yellow colour on boiling with HNO₃

all of the above

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Explanation

(d) The first is biuret test; the second is ninhydrin test and the third is xanthoproteic test; all are test of proteins.

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