The helical structure of protein is stabilised by:

Options

A. Dipeptide bonds
B. Hydrogen bonds
C. Ether bonds
D. Peptide bonds

Answer

B

Explanation

Keratin, a fibrous protein found in wool, hair, fingernails, and feathers wraps into a helical coil, much like the cord on a telephone. Called an alpha `(alpha-)-` helix, this secondary structure is stablized by the formation of hydrogen bonds between the `N - H` group of one amino acid and the `C = O` group of another amino acid four residues with a distance between turns of `0.54 nm`.