Question

The two polypeptides of human insulin are linked together by:

• A. Hydrogen bonds
• B. Phosphodiester bond
• C. Covalent bond
• D. Disulphide bridges

Answer 1

The correct option is D Disulphide bridges

Insulin is a peptide hormone produced by beta cells of the pancreatic islets.

Insulin is composed of two peptide chains referred to as the A chain and B chain. The two polypeptide chains of human insulin are linked together by disulphide bridges.

In DNA or RNA, hydrogen bonds is present between two nitrogen bases, pairs.

The phosphodiester bond is the linkage between the 3' carbon atom of one sugar molecule and the 5' carbon atom of another, deoxyribose in DNA and ribose in RNA.

A covalent bond is a chemical bond in which pairs of electrons are shared between two atoms.

So, the correct answer is "disulphide bridges".