Question

The structure of insulin consists of two polypeptide chains A and B. These two polypeptide chains have

• A. Equal number of amino acids.
• B. 21 amino acids in chain A, while 30 amino acids in chain B.
• C. 30 amino acids chain A, while 21 amino acids in chain B.
• D. 11 amino acids in chain A, while 40 amino acids in chain B.

Answer 1

The correct option is B 21 amino acids in chain A, while 30 amino acids in chain B.

Insulin is composed of two peptide chains referred to as the A chain and B chain which are linked together by two disulfide bonds. The A chain consists of 21 amino acids and the B chain of 30 amino acids.