MDCAT Biology MCQ #307

A single turn of the Krebs cycle involves several steps. How many molecules of carbon dioxide are released during one complete turn of the cycle?

MDCAT Biology MCQ #307

  1. Question 1

    Q1. A single turn of the Krebs cycle involves several steps. How many molecules of carbon dioxide are released during one complete turn of the cycle?

    • A) One
    • B) Two
    • C) Three
    • D) Four

    Answer: Two

    Explanation: Two CO2 molecules are released per turn as the 2-carbon acetyl group is oxidized. Three is tempting if counting the preparatory step.