Glycogen is a polysaccharide made up of glucose monomers. It has branched chains and a compact structure, and 1-4 and 1-6 glycosidic bonds. It is used as an energy storage molecule in animals. The branched chains mean that the molecule can be quickly be broken down by enzymes to release energy, and the compact, spiral structure allows a lot of energy to be stored in a small amount of space, making it an effective storage molecule.
