Question

Give basic structure of an antibody.

Answer 1

Each immunoglobulin is a Y-shaped molecule made of four polypeptide chains - 2 identical heavy (H) chains and 2 identical light (L) chains (H₂L₂).

The chains are held together by disulphide (-S-S-) bonds.

The two tips of the Y are the antigen-binding sites; each chain has a variable (V) region and a constant (C) region.