The 51 amino acids of insulin are arranged in
(a) single polypeptide
(b) two polypeptides, having 21 and 30 amino acids in chain A and B respectively
(c) two polypeptides having 25 and 26 amino acids
(d) two polypeptides having 18 and 33 amino acids.
Answer (b) : 51 amino acids of insulin are arranged in two polypeptide chains, chain A having 21 amino acids and chain B having 30 amino acids. The two polypeptide chains are interconnected by two disulphide bridges.
