MDCAT Biology MCQ #335

Carbon dioxide enters the stroma and is first attached to a five-carbon sugar called:

MDCAT Biology MCQ #335

  1. Question 1

    Q1. Carbon dioxide enters the stroma and is first attached to a five-carbon sugar called:

    • A) Ribulose bisphosphate (RuBP)
    • B) Phosphoglycerate (PGA)
    • C) Glyceraldehyde-3-phosphate (G3P)
    • D) Phosphoenolpyruvate (PEP)

    Answer: Ribulose bisphosphate (RuBP)

    Explanation: RuBP is the 5-carbon CO2 acceptor. G3P is tempting because it is the product, not the starting material of fixation.