Question:
How many peptide bonds does each antibody molecule have?
How many peptide bonds does each antibody molecule have?
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Antibodies are Y-shaped proteins with two heavy and two light chains connected by four peptide (disulfide) bonds.
Updated On: Oct 5, 2025
- Six
- Four
- Two
- One
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The Correct Option is B
Solution and Explanation
Step 1: Understanding antibody structure.
An antibody (immunoglobulin) molecule is a Y-shaped protein consisting of two identical heavy chains and two identical light chains. These chains are held together by peptide (disulfide) bonds.
Step 2: Number of bonds.
There are four peptide bonds (disulfide bridges) in each antibody molecule:
- Two bonds connect each light chain to a heavy chain.
- Two bonds connect the heavy chains to each other.
Step 3: Conclusion.
The correct answer is (B) Four, as each antibody molecule has four peptide (disulfide) bonds linking its chains.
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