Photophosphorylation means:
Correct answer: A. Formation of ATP from ADP in presence of light
- A. Formation of ATP from ADP in presence of light
- B. Formation of NADP
- C. Formation of ADP from ATP
- D. Formation of PGA
Explanation
Photophosphorylation is the process by which ATP is synthesized from ADP and inorganic phosphate using the energy of sunlight, which is captured during the light-dependent reactions of photosynthesis. This occurs in the thylakoid membranes of chloroplasts and is a crucial step in converting light energy into chemical energy.Option A is correct, as it accurately describes the formation of ATP in the presence of light. Option B is incorrect because NADP is a coenzyme that gets reduced to NADPH, not formed in this step. Option C is incorrect, as it describes the dephosphorylation of ATP, which is not what photophosphorylation entails. Option D is incorrect because the PGA formation is part of the Calvin cycle, not the light-dependent reactions.
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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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