This pathway uses photosystem I but not photosystem II:
Correct answer: B. Cyclic photophosphorylation
- A. Non-cyclic photophosphorylation
- B. Cyclic photophosphorylation
- C. Z-scheme
- D. Fermentation
Explanation
Cyclic electron flow is the correct answer, as it exclusively utilizes photosystem I, bypassing photosystem II. This pathway is critical in balancing the ATP/NADPH energy budget of the cell by producing additional ATP. Non-cyclic photophosphorylation, represented by both the Z-scheme and non-cyclic electron flow options, involves both photosystem I and photosystem II and results in the production of both ATP and NADPH. Therefore, they are incorrect choices for a pathway that does not involve photosystem II.
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About Bioenergetics
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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