Review Calvin Cycle begins with adding a CO2 to RuBP This reaction is catalyzed by the an enzyme....

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Photorespiration When Rubisco binds to an oxygen instead of a carbon dioxide, the newly formed molecule (still 5C like RuBP) splits. A 2C compound leaves the chloroplast and is rearranged and split by peroxisomes and mitochondria to form CO2, which is released. This process occurs in the light (photo) and involves using O2 and creating CO2 (respiration), but does NOT generate any ATP.