Answer & Explanation:
The correct statement is: Glycogen is a carbohydrate, and insulin is a protein.
Glycogen is a complex carbohydrate composed of glucose molecules linked together in a branched structure. It serves as the primary storage form of glucose in animals, including humans. It is stored in the liver and muscles, where it can be broken down to release glucose as an energy source when needed.
Insulin, on the other hand, is a protein hormone. It is produced in the pancreas and plays a crucial role in regulating blood sugar levels. Insulin facilitates the uptake of glucose from the bloodstream into cells and promotes the storage of excess glucose as glycogen in the liver. It also regulates various metabolic processes in the body.
Therefore, glycogen is a carbohydrate used for energy storage, and insulin is a protein hormone involved in glycogen storage and blood sugar regulation.