Scientists use radioactively labeled carbon dioxide (¹⁴CO₂) to track carbon atoms in a plant during photosynthesis. They find that the labeled carbon ends up in glucose molecules.
Which of the following statements best explains this result?
Carbon dioxide is broken down in the light-dependent reactions.
Carbon dioxide is fixed into organic molecules during the Calvin cycle.
Carbon dioxide is used to generate ATP in the mitochondria.
Carbon dioxide is directly converted into chlorophyll.
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