Which monomer serves as the building block of glycogen, a polymer made up of many glucose molecules?

The correct answer is glucose.

Glycogen is a polysaccharide composed of multibranched glucose units (about 8–12 glucose units) linked by the glycosidic bonds. It is a form of energy storage in the body, especially in the liver cells in the form of granules. When there is a sudden need for glucose, glucose from the glycogen can be rapidly mobilized. It also plays an important role in the glucose cycle.

Monosaccharide

Explanation:

Monosaccharides are the building blocks of sugars and contain carbon, hydrogen, and oxygen in their molecular formula.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.