Question

The secondary structure of a protein refers to:

• A. Regular folding patterns of continuous portions of the polypeptide chain
• B. Three-dimensional structure, specially the bond between amino acid residues that are distant from each other in the polypeptide chain
• C. Mainly denatured proteins and structures of prosthetic groups
• D. Linear sequence of amino acid residues in the polypeptide chain

Answer 1

The correct option is A Regular folding patterns of continuous portions of the polypeptide chain

The secondary structure of a protein refers to regular folding patterns of continuous portions of the polypeptide chain.
The secondary structure of protein refers to the shape in which a long polypeptide chain can exist. They are found to exist in two different types of structures viz. $\alpha -$helix and $\beta$-pleated sheet structure. These structures arise due to the regular folding of the backbone of the polypeptide chain due to hydrogen bonding between $>C=O$ and $-NH-$ groups of the peptide bond.