Starch, Amylose, Amylopectin and Glycogen

starch - found in plants.  It's a polymer of glucose linked in a main chain through α 1->4 links with α 1->6 branches.  Amylose is starch with no branches, while amylopectin has branches.  Starch granules consist of about 20% amylose and 80% amylopectin.

glycogen - the main CHO storage in animals.   Muscle and liver glycogen consists of glucose residues in α 1->4 links with lots of α 1->6 branches (many more branches than in starch).  

Chime Molecular Modeling: Amylose and Amylopectin