MDCAT Chemistry MCQ #249

A pharmaceutical company needs to determine the rate-determining step in the metabolism of a certain phenol. Which step typically determines the rate of metabolism in cases where multiple steps occur?

MDCAT Chemistry MCQ #249

  1. Question 1

    Q1. A pharmaceutical company needs to determine the rate-determining step in the metabolism of a certain phenol. Which step typically determines the rate of metabolism in cases where multiple steps occur?

    • A) Hydroxylation by cytochrome P450
    • B) Glucuronidation by UDP-glucuronosyltransferase
    • C) Sulfation by sulfotransferase
    • D) Acetylation by N-acetyltransferase

    Answer: Hydroxylation by cytochrome P450

    Explanation: Hydroxylation by cytochrome P450 fails due to the typically slower rate of glucuronidation compared to initial hydroxylation steps.