Why Is Carbon Dioxide a Key Molecule in the Light-Independent

question 4

Multiple Choice

Why is carbon dioxide a key molecule in the light-independent (dark) reactions of photosynthesis?

• A) CO₂ provides electrons to replace those lost by chlorophyll during the light-dependent reactions.
• B) CO₂ provides the carbon for the synthesis of sugars during carbon fixation.
• C) CO₂ is the major product of the light-independent reaction.
• D) CO₂ provides the energy for substrate-level phosphorylation.

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