The secondary structure of a protein refers to

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hydrophobic interactions

sequence of α-amino acids

fixed configuration of the polypeptide backbone

α-helical backbone

answer is D.

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Detailed Solution

The α helix and β strand are the major elements of secondary structure. The secondary structure arises due to the regular folding of the backbone of the polypeptide chain due to intramolecular hydrogen bonding between the carboxyl and amino group.

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