During the first step of the reduction phase of the Calvin cycle, the following change occurs:

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3-phosphoglycerate is phosphorylated to form 1,3-bisphosphoglycerate using ATP. In the first step of the reduction phase of the Calvin cycle, 3-phosphoglycerate is phosphorylated to form 1,3-bisphosphoglycerate using ATP from the light reactions. This step adds energy to the molecule, preparing it for the next reaction where it will be reduced by NADPH to form glyceraldehyde-3-phosphate. The use of ATP in this step marks the beginning of converting the stable product of carbon fixation into a more energy-rich compound needed for sugar synthesis.

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1,3-bisphosphoglycerate is reduced to glyceraldehyde-3-phosphate using NADPH

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Ribulose-1,5-bisphosphate reacts with carbon dioxide to form 3-phosphoglycerate

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Glyceraldehyde-3-phosphate combines to form glucose directly

During the first step of the reduction phase of the Calvin cycle, the following change occurs:

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