MDCAT Biology MCQ #197

A single turn of the Krebs cycle involves several redox reactions. How many times does decarboxylation occur within the cycle itself?

MDCAT Biology MCQ #197

  1. Question 1

    Q1. A single turn of the Krebs cycle involves several redox reactions. How many times does decarboxylation occur within the cycle itself?

    • A) Once
    • B) Twice
    • C) Three times
    • D) Four times

    Answer: Twice

    Explanation: Decarboxylation (loss of CO2) occurs twice in the cycle: during the formation of alpha-ketoglutarate and the formation of succinyl-CoA.