PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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harvesting light energy to make ATP
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receiving electrons from the thylakoid membrane ETC
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generation of molecular oxygen
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extraction of hydrogen electrons from the splitting of water
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Detailed explanation-1: -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.
Detailed explanation-2: -Photosystem I is an integral membrane protein complex that uses light energy to catalyze the transfer of electrons across the thylakoid membrane from plastocyanin to ferredoxin. Ultimately, the electrons that are transferred by Photosystem I are used to produce the moderate-energy hydrogen carrier NADPH.
Detailed explanation-3: -The first electron acceptor in the case of photosystem I is A0 which is modified chlorophyll. After which it gets transferred to phylloquinone, phylloquinone then transfers it to Ferredoxin. Note: The naming of PS I and PS II is solely based on their discovery and not on any other criteria.
Detailed explanation-4: -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-5: -3.3. Physically, photosystems are found in the thylakoid membranes. There are two kinds of photosystems: photosystem I (PSI) and photosystem II (PSII) (Fig.