In the C₃ photosynthetic pathway, the enzyme Rubisco catalyzes the reaction called

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In the C₃ photosynthetic pathway, Rubisco catalyzes the carboxylation reaction in which CO₂ is fixed into an organic compound. This is the initial step in the Calvin cycle, where carbon fixation takes place. Chemosynthesis involves the conversion of inorganic molecules into organic compounds using energy from chemical reactions, and photoreduction involves the transfer of electrons from a donor molecule to an acceptor molecule in the presence of light, neither of which are directly related to C₃ photosynthesis.

In the C₃ Photosynthetic Pathway, the Enzyme Rubisco Catalyzes the Reaction