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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.
Lesson Summary. 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.