Final answer:
G3P (glyceraldehyde-3-phosphate) is the molecule that exits the Calvin cycle to be used in glucose formation; it takes six turns of the cycle to make one glucose molecule.
Step-by-step explanation:
The molecule that leaves the Calvin cycle to be converted into glucose is G3P (glyceraldehyde-3-phosphate). In the Calvin cycle, energy in the form of ATP and NADPH is harnessed to produce G3P molecules, which store energy captured during photosynthesis. One of the G3P molecules exits the Calvin cycle and can be used in the synthesis of carbohydrates, such as glucose. It takes six turns of the Calvin cycle to produce one glucose molecule since each turn fixes one carbon atom in the form of CO2. The remaining G3P molecules are used to regenerate RuBP (ribulose bisphosphate), allowing the cycle to continue and fix additional CO2.