`alpha-`helix is a secondary structure of proteins formed by twisting of polypeptide chain into right handed screw like structure. Which type of interactions are responsible for making the `alpha`-helix structure stable?

Options

A. Petpide 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