Question

Secondary structure of proteins are classified into two different types α-helix and β-pleated sheet. Out of these two, the α-helix structure is stabilised by

(a) dipole-dipole interactions

(b) peptide bonds

(c) van der Waals’ forces

(d) hydrogen bonds

Answer 1

Answer is : (d) hydrogen bonds

In α-helix structure, hydrogen bonds are present between -- NH group of one amino acid residue to the >C = O group of another amino acid residue.