Where do the carbon atoms in glucose come from?

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RuBp (5-carbon) attaches to CO2 (1-carbon) diffusing its way in joined by an enzyme RuBisCO. It breaks into two 3-carbon molecules and gets energy from ATP and NADPH. Creates G3P (assembled into glucose or sucrose or maltose) synthesizing, taking carbon, and fixing it, making it useable. Some G3P released, most recycled again. read more

The carbon in glucose comes from carbon dioxide that enters through the plant through small holes on the bottom, called the stomata. It goes through the Calvin Cycle, and becomes glucose and other sugars. read more