An insulin molecule consists of _________ polypeptide chains?
Correct answer: B. 2
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
Insulin is a protein made of two polypeptide chains, called the A chain and B chain, joined by disulfide bonds. A common error is choosing one chain because insulin is treated as one hormone molecule, but its molecule contains two separate polypeptide chains.
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