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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.
Structural Polysaccharides: Chitin â¢ Glucose may be modified by adding a nitrogen-containing group to C2 â¢ Chitin is the polysaccharide made by joining many of these modified glucose molecules â¢ Chitin is in the exoskeletons of insects, spiders, crabs and other animals.