Which is a way that light controls the Calvin cycle activity? A) Calvin cycle enzymes are inhibited by the lower H⁺, which is pumped out of the stroma by light reactions. B) Reduced ferredoxin from the light reactions keeps thioredoxin reduced, which keeps Calvin cycle enzymes in an active form. C) High levels of ATP and NADPH from the light reactions inhibit the Calvin cycle enzymes. D) Calvin cycle or dark reaction enzyme activators are present at higher levels in the dark.

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Quizplus · Accepted Answer

Reduced ferredoxin generated by the light reactions keeps thioredoxin in a reduced state, which in turn keeps Calvin cycle enzymes active. This regulation allows for the coordination of the light reactions and Calvin cycle to optimize photosynthesis.

Which Is a Way That Light Controls the Calvin Cycle