Antigen binding site in an antibody is found between:

Options

A. two heavy chains
B. two heavy chains
C. one heavy and one light chain
D. either between two light chains or between one heavy and one light chain depending upon the nature of antgen

Answer

C

Explanation

A typical antibody monmer has four proteins chains, i.e., two identical light (L) chains and two identicl heavy (H) chains. The chains are joined by disulphide linkage and bonds to form a Y-shaped structure. Both the heavy (H) and light (L) chains habe variable regions at the ends of Y arms.
The variable region from one light chain (L) and one heavy chains (H) form one antigen binding site. Hence, each antibody has two antigen binding sites.