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 is a carbohydrate made of many linked sugar units, and it stores energy in humans. Insulin is made of amino acids, which means it is a protein. Therefore, the correct statement is “Glycogen is a carbohydrate, and insulin is a protein.”

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