MDCAT Biology MCQ #468

In the Krebs cycle, several steps involve the removal of carbon atoms. Which transition represents a decarboxylation event?

MDCAT Biology MCQ #468

  1. Question 1

    Q1. In the Krebs cycle, several steps involve the removal of carbon atoms. Which transition represents a decarboxylation event?

    • A) Citrate to Isocitrate
    • B) Succinate to Fumarate
    • C) Isocitrate to Alpha-ketoglutarate
    • D) Fumarate to Malate

    Answer: Isocitrate to Alpha-ketoglutarate

    Explanation: Isocitrate loses CO2 to become alpha-ketoglutarate; succinate to fumarate involves oxidation but no carbon loss.