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Life Science Practice Exam
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Which molecule is reduced during the light-dependent reactions and carries electrons?
ATP.
Oxygen.
NADPH.
G3P.
Reveal Answer
Correct Answer:
NADPH.
Explanation:
In the light-dependent reactions, electrons are energized by light and passed along the photosynthetic electron transport chain until they are donated to NADP+, forming NADPH. This NADPH is the reduced form of NADP+ and serves as the electron carrier that delivers reducing power to the Calvin cycle in the stroma. Oxygen is produced when water is split, not reduced. ATP is generated to provide energy, while G3P is a product of the Calvin cycle, not a direct output of the light reactions. So the molecule that gets reduced and carries electrons through this stage is NADPH.
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