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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.
The complete oxidation of glucose involves four phases. 1  1. Glycolysis, the splitting of glucose into two 3-carbon molecules. 2  2. The preparatory reaction, which divides each 3-carbon molecule into a 2-carbon molecule and CO2. 3  3. The citric acid or Krebs cycle, which produces CO2, NADH, FADH2, and ATP.