An antibody is made of _________ polypeptide chains?
Correct answer: D. 4
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
A typical antibody has four polypeptide chains: two identical heavy chains and two identical light chains joined by disulfide bonds. The two-arm Y shape can mislead students into choosing b, but the arms are formed from parts of all four chains.
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