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photorespiration. In a plant cell, the breakdown of a two-carbon compound produced by the Calvin cycle. The Calvin cycle produces the two-carbon compound, instead of its usual three-carbon product G3P, when leaf cells fix O2, instead of CO2. Photorespiration produces no sugar molecules or ATP.
Glucose is often the organic compound used in cellular respiration. The chemical reactions that take place in the cytoplasm break down the glucose into a simpler organic compound called pyruvate, in these reactions a very small amount of ATP is produced using energy released from glucose.