The correct sequence of electron carriers that receive the electrons from the primary electron acceptor of PS-II and pass them to PS-I:
Correct answer: D. PQ → Cytochrome complex → PC
- A. PS → Cytochrome complex → PQ
- B. PQ → PC → Cytochrome complex
- C. Cytochrome complex → PQ → PC
- D. PQ → Cytochrome complex → PC
Explanation
The correct sequence in the photosynthetic electron transport chain, particularly in non-cyclic photophosphorylation, starts with the primary electron acceptor of PS-II passing electrons to plastoquinone (PQ). From PQ, electrons move to the cytochrome complex and then to plastocyanin (PC) before reaching PS-I. Option D accurately represents this pathway. Other options are incorrect due to misordering: Option A incorrectly starts with the cytochrome complex instead of PQ; Option B misplaces PC before the cytochrome complex; and Option C inverts the initial steps by starting with the cytochrome complex.
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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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