Question

An immunoglobulin G molecule is composed of

• A. Two identical heavy chains and two identical light chains
• B. Two identical heavy chains and two different light chains
• C. Two different heavy chains and two identical light chains
• D. Two different heavy chains and two different light chains

Answer 1

The correct option is A Two identical heavy chains and two identical light chains

• An IgG molecule consists of two types of chains, namely heavy chains and light chains.
• Heavy chain or H chain has a molecular weight of approximately 50 kDa and the light chain or L chain has a molecule weight of approximately 25 kDa. Each IgG molecule is composed of two identical heavy chains and two identical light chains.
• These chains are linked to each other by disulfide bonds

So, the correct answer is 'Two identical heavy chains and two identical light chains'