Identify a side chain $(R)$ group present in serine,an amino acid.

The number of disulphide linkages present in insulin are

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

The helical structure of protein is stabilised by

Name the molecule which is eliminated during the formation of a peptide bond.

The amino acid containing an indole part is