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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

During the photolysis of water in photosynthesis, the electrons extracted from water are used to

A. Reduce NADP⁺ to NADPH directly
B. Replace electrons lost by the reaction center of Photosystem II
✓
C. Form a proton gradient across the thylakoid membrane by direct pumping
D. Activate the ATP synthase complex

📝 Explanation

The reaction center P680, upon excitation by light, donates an electron to the primary electron acceptor and becomes a strong oxidant (P680⁺). It extracts electrons from water molecules via the oxygen-evolving complex, splitting water and returning P680 to its ground state.

📖 Additional Information

  • Reduce NADP⁺ to NADPH directly
  • Replace electrons lost by the reaction center of Photosystem II
  • Form a proton gradient across the thylakoid membrane by direct pumping
  • Activate the ATP synthase complex

The reaction center P680, upon excitation by light, donates an electron to the primary electron acceptor and becomes a strong oxidant (P680⁺). It extracts electrons from water molecules via the oxygen-evolving complex, splitting water and returning P680 to its ground state.

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