Glycogen is the main energy storage in animals and fungi. Animal cells can get energy from glucose aswell, but the excess glucose is stored as glycogen.
It has a similar structure to amylopectin but glycogen has more and shorter side branches which means that the glucose stored can be released quickly.
It is a very compact molecule which makes it good for storage.
It is also insoluble in water, so cells don't swell due to osmosis.
It is a fairly large molecule, so lots of energy can be stored.
In humans, glycogen is stored in the liver and muscles.
Similarities between glycogen & amylopectin:
1. Consist of 1,4 & 1,6 Glycosidic bonds
2. Branched
3. Made of alpha-glucose molecules
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