Polysaccharides

When more than two monosaccharides polymerise by a condensation reaction, the result is the formation of a polysaccharide. Oligosaccharides contain typically between 3-10 monosaccharide monomers, while polysaccharides contain more than ten monosaccharide monomers, but can contain hundreds of monomers. 

Starch and cellulose

The two most common forms of polysaccharides are starch and cellulose, which are both are made up of glucose monomers. Starch is hydrolysed by enzymes into glucose monomers by animals and plants and used for energy.

Cellulose is an important structural component of the cell wall that surrounds plant cells. Hydrolysing cellulose would require enzymes that are not present in most animals. Since cellulose is not digested by most animals, it passes through the digestive system and is commonly referred to as 'dietary fibre' or simply 'fibre'

Glycogen

Glycogen is polymerised glucose for the purposes of long-term energy storage by the liver and muscle tissue and is stored in adipose (fat) tissue.