Question

The antigen-binding sites are present where on the antibody molecule

• A. on heavy chain only
• B. on the variable region and constant region of light chain
• C. on light chain only
• D. on light chain as well as on heavy chain

Answer 1

The correct option is D on light chain as well as on heavy chain

There is a unique antigen binding site in each antibody that is compatible with specific antigens. Antigen binding sites are present on the N-terminal of the peptide chain in antibodies. This site includes the variable regions of both the heavy and the light chain.