MDCAT Biology MCQ #349

When CO2 levels are low and O2 levels are high, Rubisco functions as an oxygenase. What is the two-carbon product of this reaction?

MDCAT Biology MCQ #349

  1. Question 1

    Q1. When CO2 levels are low and O2 levels are high, Rubisco functions as an oxygenase. What is the two-carbon product of this reaction?

    • A) Phosphoglycolate
    • B) Oxaloacetate
    • C) Malate
    • D) Pyruvate

    Answer: Phosphoglycolate

    Explanation: Rubisco adds oxygen to RuBP, producing phosphoglycolate and 3-PGA. Oxaloacetate is wrong because it is the first product of C4 carbon fixation.