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Glucose is a simple sugar (monosaccharide) and an important carbohydrate in biology. Cells use it as the primary source of energy and a metabolic intermediate.
Glucose is one of the main products of photosynthesis and fuels for cellular respiration. Glucose exists in several different molecular structures,
but all of these structures can be divided into two families of mirror-images (stereoisomers). Only one set of these isomers exists in nature,
those derived from the "right-handed form" of glucose, denoted D-glucose. D-glucose is often referred to as dextrose.
The term dextrose is derived from dextrorotatory glucose.Solutions of dextrose rotate polarized light to the right.
Starch and cellulose are polymers derived from the dehydration of D-glucose. The other stereoisomer, called L-glucose, is hardly ever found in nature.