transfer fixed carbon dioxide to cells in which the Calvin cycle occurs: Carbon fixation involves the addition of carbon dioxide to _____. RuBP: After 3-PGA is phosphorylated, it is reduced by _____. NADPH: How many carbon dioxide molecules must be added to RuBP to make a single molecule of glucose? 6 In the Calvin cycle, how many ATP molecules are required to regenerate RuBP from five G3P molecules?