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Question

Regarding secondary structure of a protein, correct statement(s) is/are
A) Peptide bonds possess regional planarity.
B) C=O and NH of different peptide chains are held by Van der Waal's attractions.
C) They have closely packed arrangement so as to minimise repulsion between R groups.

A
only C
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B
only B
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C
A and B
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D
only A
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Solution

The correct option is D only A
Peptide bonds possess regional planarity. For the entire molecule, the long amino acid chains exists in looped, coiled, stretched or folded structure.
Thus, the statement A is correct.

C=O and NH of different peptide chains are held by intermolecular hydrogen bonds.
Thus, the statement B is incorrect.

Closely packed arrangement is due to hydrogen bonds.
Thus, the statement C is incorrect.

Option D is correct.

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