What is the least common electron transport chain?
Correct answer: D. Both Options B and C are correct
- A. Non-cyclic electron flow
- B. Cyclic electron flow
- C. Circular electron flow
- D. Both Options B and C are correct
Explanation
Circular electron flow is not a well-known or commonly occurring electron transport chain. In photophosphorylation, the electron flow may be acyclic, i.e., starting from Photosystem 2 going to Photosystem 1 and ending in NADPH, or it may be cyclic, i.e., only cycles around Photosystem 1 if the NADPH:ATP ratio is higher than normal. The latter is relatively rare.
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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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