During cyclic photophosphorylation, electrons pass from all except:
Correct answer: C. Photosystem II
- A. Photosystem I
- B. Ferredoxin
- C. Photosystem II
- D. Cytochrome complex
Explanation
In cyclic photophosphorylation, electrons are cycled back to Photosystem I after passing through components such as ferredoxin and the cytochrome complex. Photosystem II is excluded from this pathway because it is involved in non-cyclic photophosphorylation, where it initiates the process by splitting water molecules. Therefore, the correct answer is photosystem II, as it does not participate in the cyclic electron flow.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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