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

Options

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 acid on the turn.
D. Hydrogen bonds between adjacent amino acids.

Answer

B

Explanation

In a-helix, a polypeptide chain is stabilised by the formation of hydrogen bonds between -NH-group of amino acids in one turn with group of amino acids belonging to adjacent turn.