MDCAT Biology MCQ #499

During the light-dependent reactions in the thylakoid, water molecules undergo photolysis. What is the immediate fate of the resulting oxygen atoms?

MDCAT Biology MCQ #499

  1. Question 1

    Q1. During the light-dependent reactions in the thylakoid, water molecules undergo photolysis. What is the immediate fate of the resulting oxygen atoms?

    • A) They combine with CO2 to form glucose
    • B) They are transported to the mitochondrial matrix
    • C) They are released into the atmosphere as O2
    • D) They are used to reduce NADP+ directly

    Answer: They are released into the atmosphere as O2

    Explanation: Oxygen is released as a byproduct into the atmosphere; protons and electrons are used within the chloroplast for further reactions.