Glycogen is a polysaccharide. It is a complex carbohydrate that serves as a form of energy storage in animals and fungi.
Polysaccharides are large molecules composed of many monosaccharide units linked together. In the case of glycogen, it is made up of numerous glucose molecules joined by glycosidic bonds.
The structure of glycogen is highly branched, which allows for rapid release of glucose when energy is needed by the body. This branching structure is particularly important during periods of intense physical activity, as it enables quick mobilization of glucose reserves.
In contrast, monosaccharides are the simplest form of carbohydrates, consisting of single sugar molecules like glucose and fructose. Unlike glycogen, they do not provide energy storage but serve as building blocks for polysaccharides and other biomolecules.
In summary, glycogen qualifies as a polysaccharide due to its complex structure and function as an energy reserve, making it distinct from monosaccharides.