Water splits during photosynthesis in/on:
Correct answer: A. Interior space of the thylakoid
- A. Interior space of the thylakoid
- B. Outside the thylakoid membrane
- C. Into the stroma
- D. At the ATP synthase complex
Explanation
Water splitting, or photolysis, is a critical step in the light-dependent reactions of photosynthesis. It occurs in the interior space of the thylakoid (thylakoid lumen), where water molecules are split to release oxygen, protons, and electrons. The electrons are then used to replace those lost by chlorophyll in photosystem II. The other options are incorrect because they either describe locations not involved in water splitting or describe processes that occur after water splitting.
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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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