Cyclic photophosphorylation involves:
Correct answer: A. PS I
- A. PS I
- B. PS I and PS II
- C. PS II
- D. P680
Explanation
Cyclic photophosphorylation involves only Photosystem I (PS I). In this process, electrons are transferred cyclically back to the PS I reaction center, allowing for the production of ATP without the generation of NADPH. This contrasts with non-cyclic photophosphorylation, which involves both PS I and PS II and leads to the production of both ATP and NADPH. Options B, C, and D are incorrect because they involve elements not part of the cyclic photophosphorylation pathway: PS II is not involved (hence options B and C are wrong), and P680 is a component of PS II, not PS I (hence option D is wrong).
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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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