Which of the following bonds link the A and B peptides of Insulin ?

Disulfide bonds

The link between the A and B peptides of insulin is primarily formed by disulfide bonds.

Insulin is a peptide hormone composed of two polypeptide chains linked together. These chains are termed the A chain (composed of 21 amino acids) and the B chain (composed of 30 amino acids). The connection between the A and B chains in insulin is predominantly through disulfide bonds, which form between specific cysteine amino acids on each chain. These disulfide bonds contribute to the three-dimensional structure and stability of the insulin molecule, influencing its biological activity and function in regulating blood sugar levels.