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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Proteins are polymers of amino acids joined by peptide bonds, and their function depends on primary, secondary, tertiary and quaternary structure. The topic covers fibrous and globular proteins, enzymes, antibodies, hormones and transport proteins, as well as denaturation by heat or extreme pH.
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