In the process of carbon fixation, three molecules of RuBP combine with three molecules of CO₂ to produce three six-carbon molecules, which are then split to produce 12 molecules of 3-phosphoglycerate. After phosphorylation and reduction produce 12 glyceraldehyde 3-phosphate (G3P), what more needs to happen to complete the Calvin cycle?

Question

Quizplus · Accepted Answer

After the production of 12 molecules of G3P, two molecules of G3P are released to produce sugars, while the remaining 10 molecules of G3P are used to regenerate six molecules of RuBP. This requires an input of ATP to convert the 10 G3P molecules into six RuBP molecules, which will complete the cycle and allow for the process of carbon fixation to continue. Therefore, choice E, release of one G3P to make sugars and regeneration of RuBP, is the best answer.

In the Process of Carbon Fixation, Three Molecules of RuBP