MDCAT Biology MCQ #346

The reduction and regeneration phases of the Calvin cycle require chemical energy. How many total ATP molecules are consumed per CO2 fixed?

MDCAT Biology MCQ #346

  1. Question 1

    Q1. The reduction and regeneration phases of the Calvin cycle require chemical energy. How many total ATP molecules are consumed per CO2 fixed?

    • A) 1 ATP
    • B) 2 ATP
    • C) 9 ATP
    • D) 3 ATP

    Answer: 3 ATP

    Explanation: Three ATP molecules are consumed per CO2 molecule fixed in the Calvin cycle. Two ATP is tempting as it only covers reduction.