Question

Secondary structure of protein refers to ?

• A. sequence of amino acids in polypeptide chain
• B. bonds between alternate polypeptide chains
• C. folding patterns of polypeptide chain
• D. bonding between ${NH}_3^{+}$ and ${COO}^{-}$ of two peptides

Answer 1

The correct option is C folding patterns of polypeptide chain

Protein secondary structure is the three-dimensional form of local segments of proteins. The two most common secondary structural elements are alpha helices and beta sheets, though beta turns and omega loops occur as well. Secondary structure elements typically spontaneously form as an intermediate before the protein folds into its three-dimensional tertiary structure.

The secondary structure is formally defined by the pattern of hydrogen bonds between the amino hydrogen and carboxyl oxygen atoms in the peptide backbone.

Hence, the correct option is $\text{C}$