Question

Proteins are found to have two different types of secondary structures: $\alpha$ helix and $\beta$ pleated sheet. $\alpha$ helix structure of protein is stabilised by :

• A. peptide bonds
• B. van der Waals forces
• C. hydrogen bonds
• D. none of these

Answer 1

The correct option is C hydrogen bonds

$\alpha$-helix is one of the most common ways in which a polypeptide chain exists and forms all possible hydrogen bonds by twisting into a right-handed screw (helix) with the $-NH$ group of each amino acid residue hydrogen-bonded to the $C=O$ of an adjacent turn of helix.