Concept 28 - Concept10. ,

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Concept 10.3 The Calvin cycle uses ATP and NADPH to convert CO to sugar. The Calvin cycle regenerates its starting material after molecules enter and leave the cycle. The Calvin cycle is anabolic, using energy to build sugar from smaller molecules. Carbon enters the cycle as CO and leaves as sugar. The cycle spends the energy of ATP and the reducing power of electrons carried by NADPH to  make sugar. The actual sugar product of the Calvin cycle is not glucose but a three-carbon sugar,  glyceraldehyde-3-phosphate (G3P) . Each turn of the Calvin cycle fixes one carbon. For the net synthesis of one G3P molecule, the cycle must take place three times, fixing three  molecules of CO 2 . To make one glucose molecule requires six cycles and the fixation of six CO molecules. The Calvin cycle has three phases: carbon fixation, reduction, and regeneration of the CO acceptor.
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