In the light reactions, the final electron acceptor that forms NADPH is which molecule?

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Multiple Choice

In the light reactions, the final electron acceptor that forms NADPH is which molecule?

In photosynthetic light reactions, electrons move through the photosynthetic electron transport chain and are ultimately transferred to NADP+, which, with a proton, becomes NADPH. This NADPH provides the reducing power for the Calvin cycle, making NADP+ the final electron acceptor in this pathway. NAD+ would not be reduced to NADPH in this context, and FAD and ADP play different roles (FAD as a separate redox cofactor in other reactions, and ADP being used to make ATP). The key idea is that NADP+ accepts electrons and a proton to form NADPH, supplying the reducing equivalents needed for carbon fixation.

In photosynthetic light reactions, electrons move through the photosynthetic electron transport chain and are ultimately transferred to NADP+, which, with a proton, becomes NADPH. This NADPH provides the reducing power for the Calvin cycle, making NADP+ the final electron acceptor in this pathway. NAD+ would not be reduced to NADPH in this context, and FAD and ADP play different roles (FAD as a separate redox cofactor in other reactions, and ADP being used to make ATP). The key idea is that NADP+ accepts electrons and a proton to form NADPH, supplying the reducing equivalents needed for carbon fixation.

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