Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

Question

BlackTom AI · Accepted Answer

To determine which molecules are produced during the light reactions and subsequently used by the Calvin cycle, we need to recall the roles of the light-dependent stage of photosynthesis.
Option 1: 'CO2 and glucose' – These are primary products of the Calvin cycle and overall photosynthesis inputs/outputs, not the direct outputs of the light reactions. CO2 is fixed in the Calvin cycle, and glucose is synthesized later from the triose phosphates produced in the cycle. Therefore, this option incorrectly pairs Calvin-cycle outputs with light-reaction products.
Option 2: 'H2O and O2' – Water is consumed during the light reactions as electrons are extracted from water to form oxygen; oxygen is released as a byproduct. These are inputs/outputs of the light reactions themselves, not the immediate products used by the Calvin cycle. The Calvin cycle does not use molecular oxygen or water directly as its energy carriers.
Option 3: 'ADP, Pi, and NADP+' – ADP and inorganic phosphate (Pi) are substrates regenerated after the ATP synthase uses the proton gradient, and NADP+ is the oxidized form that accepts electrons to become NADPH. However, the Calvin cycle does not utilize ADP, Pi, and NADP+ as the immediate energy-rich carriers; it uses ATP and NADPH produced by the light reactions. This option lists the regenerated forms rather than the reduced energy carriers delivered to the cycle, so it is not accurate as the primary products used by the Calvin cycle.
Option 4: 'ATP and NADPH' – These are the main energy carriers produced during the light-dependent reactions: ATP provides energy, and NADPH provides reducing power. Both are directly consumed by the Calvin cycle to drive carbon fixation and carbohydrate synthesis. This aligns with the established linkage wherein the light reactions supply ATP and NADPH to power the Calvin cycle.
In summary, options 1 and 2 misidentify the direct products or misplace the role of light-reaction outputs, option 3 lists regenerated forms rather than the actual energy carriers used by the Calvin cycle, and option 4 correctly identifies ATP and NADPH as the products of the light reactions that fuel the Calvin cycle.

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?单项选择题

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