MDCAT Biology MCQ #527

In the stroma of a chloroplast, carbon dioxide is attached to a five-carbon sugar. Which enzyme facilitates this crucial fixation step?

MDCAT Biology MCQ #527

  1. Question 1

    Q1. In the stroma of a chloroplast, carbon dioxide is attached to a five-carbon sugar. Which enzyme facilitates this crucial fixation step?

    • A) ATP synthase
    • B) Rubisco
    • C) PEP carboxylase
    • D) NADP reductase

    Answer: Rubisco

    Explanation: Rubisco catalyzes the fixation of CO2 to RuBP. PEP carboxylase is used in C4 plants, which is a different metabolic pathway.