PHOTOSYNTHESIS
LIGHT DEPENDENT REACTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Electrons from PS I cause the reduction of NADPH to NADP+
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Electrons from PSII cause the reduction of NADP+ to NADPH.
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Electrons from PS I cause the reduction of NADP+ to NADPH.
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Electrons are gained causing the oxidation of NADP+NADP+.
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Detailed explanation-1: -The electrons travel through the chloroplast electron transport chain to photosystem I (PSI), which reduces NADP+ to NADPH. The electron transport chain moves protons across the thylakoid membrane into the lumen.
Detailed explanation-2: -The reaction center chlorophyll of photosystem I transfers its excited electrons through a series of carriers to ferrodoxin, a small protein on the stromal side of the thylakoid membrane. The enzyme NADP reductase then transfers electrons from ferrodoxin to NADP+, generating NADPH.
Detailed explanation-3: -NADPH will travel to the Calvin cycle, where its electrons are used to build sugars from carbon dioxide.
Detailed explanation-4: -Energy from sunlight is used to extract electrons from water once a photon strikes the photosystem II (PSII) reaction center. The electrons move to photosystem I (PSI), which converts NADP+ to NADPH, via the chloroplast electron transport chain.
Detailed explanation-5: -Photosystem I receives electrons from plastocyanin or cytochrome c6 on the lumenal side of the thylakoid membrane and uses light energy to transfer them across the membrane to ferredoxin on the stromal side. It can also function in a cyclic electron transport pathway.