1 monosaccharides mainly include five-carbon sugars such as ribose and deoxyribose and six-carbon sugars such as glucose and fructose.

2 disaccharides are mainly sucrose and maltose in plant cells and lactose in animal cells;

3 polysaccharide plant cells are mainly starch and cellulose, and animal cells are mainly glycogen.

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Carbohydrate is a biomacromolecule composed of C, H and O, which can be divided into monosaccharide, disaccharide and polysaccharide. Sugar is an important organic compound widely distributed in nature. Sucrose, starch in grains, cellulose in plants and glucose in human blood are all sugars. Sugar plays an important role in the process of life activities and is the main source of energy needed by all living things to maintain life activities. The most important sugars in plants are starch and cellulose, and the most important polysaccharide in animal cells is glycogen.