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Consider these statements about enzyme-inhibitor drugs: (A) They include competitive and non-competitive inhibitor drugs. (B) They can bind at active sites and at allosteric sites. (C) Competitive drugs are allosteric-site-blocking drugs. (D) Non-competitive drugs are active-site-blocking drugs. Which statements are correct?

1. (A), (D) only
2. (A), (C) only
3. (A), (B) only
4. (A), (B), (C) only

Correct answer: (A), (B) only

Solution

(A) and (B) are correct. (C) and (D) are reversed: competitive drugs block the active site, while non-competitive drugs bind the allosteric site.

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