Glucose is a common example of a monosaccharide. Monosaccharides are simple sugars that cannot be broken down into a simpler form. Glucose is a carbohydrate with the formula C6H12O6 and is also known as dextrose or blood sugar.
Other examples of monosaccharides include galactose, fructose and ribose. Galactose is found in milk, fructose is found in fruits, and ribose is found in RNA. Combinations of two monosaccharides form disaccharides, such as lactose and sucrose. Lactose is milk sugar and is made of glucose and galactose. Sucrose is white table sugar and is made of glucose and fructose. Molecules of monosaccharides and disaccharides combine to form complex carbohydrates, such as starch, cellulose and glycogen.