14. The process of photorespiration involves
a competition between CO2 and O2 for the active site on
the enzyme Rubisco, which catalyzes the fixing of CO2 into organic molecules
during the Calvin cycle. During photorespiration, the O2 bonds to the active
site of Rubisco & prevents CO2 from binding to it, which thus slows down
photosynthesis because less CO2 is "fixed" and thus less sugar will
be made!
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Slichter