Question

Which type of interactions are responsible for making the $\alpha -$ helix structure stable?

• A. Peptide bonds between $-{NH}_2$ and$-CO$ groups of adjacent carbon chains
• B. Hydrogen bonds between $-NH$ of amino acid in one turn with $-CO$ of amino acid to adjacent turn
• C. $-OH$ group of one amino acid with $-CO$ group of other amino acids on the turn
• D. Hydrogen bonds between adjacent amino acids

Answer 1

The correct option is B Hydrogen bonds between $-NH$ of amino acid in one turn with $-CO$ of amino acid to adjacent turn

$\alpha$-helix structures are held in shape by hydrogen bonds, which form between the carbonyl O of one amino acid and the amino H of another amino acid which make it stable.