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The secondary structure of a protein refers to

(a) fixed configuration of the polypeptide backbone

(b) α-helical backbone

(c) hydrophobic interactions

(d) sequence of aamino acids.

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(b) : Secondary structure of proteins is mainly of two types. 

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

(ii) β-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.

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