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

Secondary structures of protein denotes the shape in which a long polypeptide chain exists. The secondary structure exists in two type of structure `alpha` - helix and `beta` - pleated structure. In `alpha` - helix structure, a polypeptide chain forms all possible hydrogen bonds by twisting into a right handed screw with -NH group of each amino acid rest hydrogen bonded to `gt C =O` of adjacent amino acid, which form a helix.