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Which of the following statements is not true of most cellular redox reactions?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
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How many photons are required to fully reduce one molecule of NADP+ to NADPH in photosynthesis?
A
1 photon
B
4 photons
C
2 photons
D
6 photons
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Understand the role of NADP+ in photosynthesis: NADP+ is reduced to NADPH during the light-dependent reactions of photosynthesis, which involves the transfer of electrons.
Recognize that the reduction of NADP+ to NADPH requires the input of energy, which is provided by photons absorbed by chlorophyll in the photosystems.
Recall that photosynthesis involves two main photosystems: Photosystem II (PSII) and Photosystem I (PSI). Each photosystem absorbs photons to energize electrons.
In Photosystem II, photons are absorbed to split water molecules, releasing electrons, which are then transferred through the electron transport chain to Photosystem I.
In Photosystem I, additional photons are absorbed to further energize the electrons, which are ultimately used to reduce NADP+ to NADPH. This process requires a total of two photons, one for each photosystem, to fully reduce one molecule of NADP+ to NADPH.
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