Photosynthesis • Light Reactions produces ATP and NADPH • Carbon fixation reaction incorporates CO 2 into sugars – Normal fixation is by Calvin Cycle: C-3 pathway • CO 2 + Ribulose-1, 6 -bisphosphate forms 2 molecules of PGA – C-4 plants prefix CO 2 into oxaloacetic acid and malic acid prior to the Calvin Cycle