Which two reactions occur during photophosphorylation.
Correct answer: C. ATP is synthesized and NADP is reduced
- A. ATP is hydrolysed and NADP is reduced
- B. ATP is hydrolysed and NADPH is oxidized
- C. ATP is synthesized and NADP is reduced
- D. ATP is synthesized and NADPH is oxidized
Explanation
During photophosphorylation, which is part of the light-dependent reactions of photosynthesis, ATP is synthesized through a process known as chemiosmosis. Concurrently, NADP is reduced to NADPH by gaining electrons and protons. This process is crucial for converting light energy into chemical energy stored in ATP and NADPH, which are then used in the Calvin cycle. The incorrect options either mention the hydrolysis of ATP, which does not occur in photophosphorylation, or the oxidation of NADPH, which is incorrect as NADPH is the reduced form.
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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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