Glycogen is the storage form of which sugar?

Glycogen is the storage form of which sugar?

• A. Glucose
• B. Fructose
• C. Galactose
• D. Sucrose

Answer: (A)

Glycogen stores energy in animals by linking multiple glucose units into a highly branched polymer. Because the building block is glucose, the storage form is glucose itself. Fructose and galactose are other simple sugars used in metabolism, not stored as glycogen. Sucrose is a disaccharide made of glucose and fructose and isn’t stored as glycogen either. Glycogen’s structure—many glucose units with branching—allows rapid release of glucose when the body needs quick energy, especially in the liver for bloodstream maintenance and in muscles for local use during activity.

Glycogen stores energy in animals by linking multiple glucose units into a highly branched polymer. Because the building block is glucose, the storage form is glucose itself. Fructose and galactose are other simple sugars used in metabolism, not stored as glycogen. Sucrose is a disaccharide made of glucose and fructose and isn’t stored as glycogen either. Glycogen’s structure—many glucose units with branching—allows rapid release of glucose when the body needs quick energy, especially in the liver for bloodstream maintenance and in muscles for local use during activity.