Glycogen is an energy-storage molecule in humans. A hormone that is called insulin controls the storage of glycogen in the liver. Insulin is made up of amino acids. Which statement correctly identifies the types of macromolecules that are described?

Glycogen stores energy and is a polysaccharide, so it is a carbohydrate. Insulin is made of amino acids, and molecules made of amino acids are proteins. Therefore, the correct statement is that glycogen is a carbohydrate and insulin is a protein.

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