Photorespiration is the process in which plants are metabolized. The enzyme rubisco oxygenates Rubp and waste some of the energy that is produced in photosynthesis. The desired reaction is the addition of carbon dioxide to Rubp, known as carboxylation, which is an important step in the Calvin cycle. Approximately 25% of the reactions by rubisco actually add oxygen to Rubp known as oxygenation. This product cannot be used within the Calvin cycle.
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