Proteins are found to have two different types of secondary structures viz `alpha`-helix and `beta`-pleated sheet structure. `alpha`-helix structure of protein is stabilised by

Options

A. Peptide bonds
B. van der Waals forces
C. Hydrogen bonds
D. Dipole-dipole interactions

Answer

C

Explanation

`alpha`-helix structure of protein is stabilised by hydrogen bonds. A polypeptide chain forms all possible hydrogen bonds by twisting into right-handed helix with the NH group of each amino acid residue hydrogen bonded to `gt C=O` of an adjacent turn of helix