CO2 AND RUBISCO. “In the marine environment, CO2 is present in micromolar concentrations, which may be lower than the dissociation constant (Km) for the photosynthetic carbon-fixing enzyme ribulose bisphosphate carboxylase oxygenase (Rubisco). Phytoplankton species that rely on CO2 diffusion to supply photosynthesis may be rate-limited by the CO2 concentration and diffusion to the site of Rubisco in the chloroplast.”
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