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Question

Question: The secondary structure of protein refers to:...

The secondary structure of protein refers to:

A

α\alpha -helical backbone.

B

Hydrophobic interactions.

C

Sequence of a-amino acids.

D

Fixed configuration of the polypeptide backbone.

Answer

Fixed configuration of the polypeptide backbone.

Explanation

Solution

Secondary structure of proteins is mainly of two types.

(i) α\alpha -helix : This structure is formed when the chain of a-amino acid coils as a right handed screw (called α\alpha - helix) becaues of the formation of the hydrogen bonds between amide group of the same peptide chain.

(ii) β\beta - plated sheet : In this structure the chains are held together by a very large number of hydrogen bonds between

C = O and NH of different chains.