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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.
1 Glucose is produced when carbohydrates are digested or metabolized. 2  Glucose is sometimes referred to as dextrose. 3  Starch is comprised of long chains of glucose. 4  Glucose make up exactly half of the sugar in sucrose and nearly half of the sugar in high fructose corn syrup.