<P> Glycogen is the analogue of starch , a glucose polymer that functions as energy storage in plants . It has a structure similar to amylopectin ( a component of starch ) , but is more extensively branched and compact than starch . Both are white powders in their dry state . Glycogen is found in the form of granules in the cytosol / cytoplasm in many cell types , and plays an important role in the glucose cycle . Glycogen forms an energy reserve that can be quickly mobilized to meet a sudden need for glucose , but one that is less compact than the energy reserves of triglycerides ( lipids ) . </P>
glycogen and amylopectin are long chains of which simple sugar ( s )
glucose