Which Is a Way That Light Controls the Calvin Cycle

question 70

Multiple Choice

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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