MDCAT Biology MCQ #551

A yeast cell is moved from an aerobic to an anaerobic environment. What is the most drastic change in its energy economy?

MDCAT Biology MCQ #551

  1. Question 1

    Q1. A yeast cell is moved from an aerobic to an anaerobic environment. What is the most drastic change in its energy economy?

    • A) The net yield of ATP molecules per glucose
    • B) The initial stage of glucose breakdown
    • C) The use of NAD+ as an electron carrier
    • D) The production of pyruvate as an intermediate

    Answer: The net yield of ATP molecules per glucose

    Explanation: Aerobic respiration yields 36-38 ATP per glucose, while anaerobic respiration (fermentation) yields only 2 ATP.