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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.
Starch is long chains of sugar molecules linked together. It is a polysaccharide, which is many sugar molecules linked together, as opposed to a monosaccharide, which is a single sugar molecule. Starch is made from glucose, a sugar molecule made up of carbon (C), hydrogen (H), and oxygen (O) with a basic chemical formula C6H12O6.