MDCAT Biology MCQ #194

During carbon fixation in the stroma, CO2 combines with RuBP. What is the first stable 3-carbon intermediate formed in this C3 pathway?

MDCAT Biology MCQ #194

  1. Question 1

    Q1. During carbon fixation in the stroma, CO2 combines with RuBP. What is the first stable 3-carbon intermediate formed in this C3 pathway?

    • A) Oxaloacetate
    • B) 3-phosphoglycerate
    • C) Ribulose bisphosphate
    • D) Phosphoglycolate

    Answer: 3-phosphoglycerate

    Explanation: The first stable product in C3 plants is the 3-carbon 3-phosphoglycerate; oxaloacetate is the first product in C4 plants.