Glycogen is a molecule that contains many glucose molecules. Which best describes glycogen?
A. Glycogen is a lipid and helps the body use energy.
B. Glycogen is a polysaccharide and helps the body use energy.
C. Glycogen is an amino acid and is used as a building block for other materials.
D. Glycogen is a nucleic acid and is used as a building block for other materials.
