Carbon Fixation by RuBisCO
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Carbon fixation is the enzyme RuBisCO attaching a carbon dioxide molecule to RuBP, converting inorganic carbon into an organic, three-carbon compound.
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RuBisCO combines each incoming carbon dioxide molecule with a five-carbon RuBP molecule to produce two molecules of three-carbon 3-PGA.
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Carbon fixation is the Calvin cycle's entry point for carbon dioxide, distinct from the light-dependent reactions that supply its energy.