Question

Antibody molecule has:

• A. Two peptide chain
• B. Three peptide chain
• C. Four peptide chain
• D. One polypeptide chain

Hint:

Antibodies, also known as immunoglobulins, have two identical heavy chains and two identical light chains.

Answer 1

The Correct Option is A

An antibody molecule consists of two peptide chains: one heavy chain and one light chain, which are connected by disulfide bonds.
Conclusion: The correct answer is (1) Two peptide chain.
Final Answer: \[ \boxed{\text{The correct answer is Two peptide chain.}} \]