Question

Which type of interactions are responsible for

making the

 -helix structure stable?

(1) Peptide bonds between —NH2 and —CO groups

of adjacent carbon chains.

(2) Hydrogen bonds between —NH of amino acid in

one turn with —CO of amino acid to adjacent turn.

(3) —OH group of one amino acid with —CO group

of other amino acid on the turn.

(4) Hydrogen bonds between adjacent amino acids.​

Answer 1

I think 4rth option is correct