Question

which provides long - term energy storage?
glycogen, because it is a polysaccharide
glucagon, because it is a complex protein
glucose, because it is a monosaccharide
cellulose, because it is a complex carbohydrate

Explanation:

• Glycogen is a polysaccharide. In animals, it serves as a form of long - term energy storage. When the body needs energy, glycogen can be broken down into glucose.
• Glucagon is a hormone (a protein) that regulates blood glucose levels by stimulating the breakdown of glycogen (not a storage form itself).
• Glucose is a monosaccharide. It is the immediate energy source (e.g., in cellular respiration) rather than a long - term storage form.
• Cellulose is a complex carbohydrate, but in most animals (including humans), it cannot be digested for energy. In plants, it provides structural support.

Answer:

glycogen, because it is a polysaccharide