NADP+ reductase accepts electrons from?
Correct answer: B. Ferredoxin
- A. Plastoquinone
- B. Ferredoxin
- C. Cytochrome complex
- D. Plastocyanin
Explanation
Ferredoxin is the correct answer because it is the final electron carrier in the photosynthetic electron transport chain that directly transfers electrons to NADP⁺ reductase. After receiving high-energy electrons from photosystem I, reduced ferredoxin donates these electrons to NADP⁺ reductase, which then catalyzes the formation of NADPH from NADP⁺ and H⁺. This reaction is essential for converting light energy into chemical energy stored in NADPH, which is later used in the Calvin cycle for carbon fixation. Plastoquinone is incorrect because it carries electrons between photosystem II and the cytochrome b6f complex, not to NADP⁺ reductase. Plastocyanin is incorrect because it transfers electrons from the cytochrome b6f complex to photosystem I. The cytochrome complex itself is also incorrect because it only facilitates electron transport and proton pumping between photosystem II and photosystem I, not the reduction of NADP⁺.
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