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Question

An immunoglobulin G molecule is composed of

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

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'

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