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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 Starch is a storage polysaccharide composed entirely of glucose monomers. 2  Most of these monomers are joined by 1â4 linkages (number 1 carbon to number 4 carbon) between the glucose molecules. 3  The simplest form of starch, amylose, is unbranched and forms a helix.