Biochemistry - Mock Test 95

Question 941

Denaturation of proteins results in?

A) Disruption of primary structure B) Breakdown of peptide bonds C) Destruction of hydrogen bonds D) Irreversible changes in the molecule

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Question 942

The technique for purification of proteins that can be made specific for a given protein is?

A) Gel filtration chromotography B) Ion exchange chromatography C) Electrophoresis D) Affinity chromatography

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Question 943

In a protein molecule the disulphide bond is not broken by?

A) Reduction B) Oxidation C) Denaturation D) X-ray diffraction

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Question 944

Tertiary structure of a protein describes?

A) The order of amino acids B) Location of disulphide bonds C) Loop regions of proteins D) The ways of protein folding

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Question 945

The primary structure of fibroin, the principal protein of silk worm fibres consists almost entirely of?

A) Glycine B) Aspartate C) Keratin D) Tryptophan

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Question 946

Both α-helix and β-pleated sheet conformation of proteins were proposed by?

A) Watson and Crick B) Pauling and Corey C) Waugh and King D) Y.S.Rao

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Question 947

At the lowest energy level α-helix of polypeptide chain is stabilised?

A) By hydrogen bonds formed between the H of peptide N and the carbonyl O of the residue B) Disulphide bonds C) Non polar bonds D) Ester bonds

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Question 948

The a-helix of proteins is?

A) A pleated structure B) Made periodic by disulphide bridges C) A non-periodic structure D) Stabilised by hydrogen bonds between NH and CO groups of the main chain

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Question 949

In proteins the α-helix and β-pleated sheet are examples of?

A) Primary structure B) Secondary structure C) Tertiary structure D) Quaternary structure

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Question 950

The number of helices present in a collagen molecule is?

A) 1 B) 2 C) 3 D) 4

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