alleryStart learning →Which product does photosystem I capture the energy to make?
AThe proton gradient across a membrane
BThe reduced carrier called NADPH
CThe waste oxygen released by a leaf
DThe five-carbon acceptor of the cycle
Answer & Solution
Correct answer: B. The reduced carrier called NADPH
1. Photosystem II captures the energy that creates the proton gradient used to make adenosine triphosphate.
2. Photosystem I captures the energy that reduces the oxidized carrier into NADPH.
3. The two work in concert so that the production of NADPH will roughly equal the production of adenosine triphosphate.
4. Other mechanisms fine tune that ratio to match the chloroplast's changing needs.
5. Oxygen comes from splitting water at photosystem II, so it belongs to the other complex.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.2 The Light-Dependent Reactions of Photosynthesis_
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