Multiple Choice
In the light reactions of photosynthesis, what is the primary role of water (H2O)?
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9. Photosynthesis
Light Reactions of Photosynthesis
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During the light reactions of photosynthesis, at which step is molecular oxygen (O2) produced?
A
When NADP+ is reduced to NADPH at the end of photosystem I
B
When water is split at photosystem II (photolysis) to replace electrons lost by chlorophyll
C
When ATP is synthesized by ATP synthase as protons flow down their gradient
D
When carbon dioxide is fixed to ribulose-1,5-bisphosphate (RuBP) by Rubisco in the Calvin cycle
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