Glycogen is found in animal cells and starch is found in plant cells.
Glycogen is a polysaccharide of glucose. It is used to store energy in animal cells. The linear chains in a glycogen molecule are linked by α(1,4) glycosidic bonds while the branched chains are linked by α(1,6) glycosidic bonds. Glycogen breaks into glucose to provide energy to the body when needed.
Starch is the polysaccharide of plants and is made up of glucose units. They are joined by glycosidic bonds. It is found in most plant-based foods and is a common carbohydrate in the human diet. It has two types of molecules helical amylose and branched amylopectin. Amylose forms 20-25% of starch whereas amylopectin forms 75-80% of it.
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