Biology / Bio 0597 · Atom · ~20 seconds
Photosystem I and NADPH Formation
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Photosystem I absorbs light to re-energize the arriving electron, then passes it to NADP+, reducing it to NADPH for use in the Calvin cycle.
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NADPH built at photosystem I carries its high-energy electron to the light-independent reactions, playing the role NADH plays in cellular respiration.
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Photosystem I does not replace its own electron by splitting water — only photosystem II does that.