There are three classes of carbohydrates:
Monosaccharides, Disaccharides and Polysaccharides
Monosaccharides are the simplest unit of carbohydrates eg. glucose, fructose and galactose.
Disaccharides are two monosaccharides chemically combined eg. sucrose (glucose + fructose), lactose (glucose + galactose), maltose (glucose + glucose)
Polysaccharides are long chains of monosaccharides chemically combined eg. starch, glycogen and cellulose.
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