Question

An antibody molecule is represented as $H_2{L}_2$ . This implies that

• A. each antibody has four antigen-binding sites.
• B. each antibody molecule has four peptide chains, two small called light chains and two longer called heavy chains.
• C. there are 2 interchain disulphide bonds.
• D. there are 2 intrachain disulphide bonds.

Answer 1

Answer: (B)

Antibodies are protective proteins called immunoglobulins, which are produced by the immune system to attack the foreign substance called an antigen. The structure of antibodies comprises of four polypeptides of which two are heavy chains (identical) and two are light chains(identical). Hence it is represented by $H_2{L}_2$ . These chains form a Y shaped molecule