One turn of the Calvin cycle fixes a molecule of CO₂ gas and is driven by 3 molecules of ATP and 2 molecules of NADPH from the light reactions.Which of the following is true?

Question

Quizplus · Accepted Answer

Each turn of the Calvin cycle fixes one molecule of carbon dioxide and requires 3 molecules of ATP and 2 molecules of NADPH from the light reactions. To produce a glucose molecule, which contains 6 carbons, the Calvin cycle must occur 6 times, requiring 18 molecules of ATP and 12 molecules of NADPH. Therefore, option B is the correct answer. Option A is incorrect because it underestimates the number of turns, ATP, and NADPH needed to produce a glucose molecule. Option C is incorrect because the Calvin cycle can occur in both light and dark conditions, although it is more efficient in the light. Option D is incorrect because the Calvin cycle is endergonic, meaning it requires an input of energy.

One Turn of the Calvin Cycle Fixes a Molecule of CO2

One Turn of the Calvin Cycle Fixes a Molecule of CO₂