Why Are Plants Unlikely to Produce Many Carbohydrates at Night

question 62

Multiple Choice

Why are plants unlikely to produce many carbohydrates at night?

• A)Selected Calvin cycle enzymes are inactive in the dark because they denature at night.
• B)Selected Calvin cycle enzymes are immobilized at night.
• C)Chloroplasts shrink at night.
• D)Selected Calvin cycle enzymes are inactive in the dark because thioredoxin is oxidized and cannot reduce their disulfide linkages.
• E)Selected Calvin cycle enzymes are inactive in the dark because thioredoxin is reduced and can break their disulfide linkages.

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