Which Type of Interaction Stabilizes the α Helix and the β

Question

Which type of interaction stabilizes the α helix and the β pleated sheet structures of proteins?
A)hydrophobic interactions
B)disulphide bonds
C)ionic bonds
D)hydrogen bonds
E)peptide bonds

Accepted Answer

The α helix and β pleated sheet structures are stabilized by hydrogen bonds between the carbonyl group of one amino acid and the amino group of another amino acid four residues down the polypeptide chain (in the case of the α helix) or between adjacent strands of the β sheet. Hydrophobic interactions, disulphide bonds, ionic bonds, and peptide bonds are important for stabilizing other aspects of protein structure, but not specifically the α helix or β sheet.