Question

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 protein, and insulin is a lipid.
○ glycogen is a protein, and insulin is a protein.
○ glycogen is a carbohydrate, and insulin is a lipid.
○ glycogen is a carbohydrate, and insulin is a protein.

Explanation:

1. Recall the definitions of macromolecule types:

• Carbohydrates: Include polysaccharides like glycogen (a storage form of glucose in animals).
• Proteins: Are made of amino acids; insulin is a hormone made of amino acids, so it is a protein.
• Lipids: Are not made of amino acids and have different structures/functions (e.g., fats, steroids).

1. Analyze each option:

• Option 1: Glycogen is not a protein (it’s a carb), insulin is not a lipid (it’s a protein) → Incorrect.
• Option 2: Glycogen is not a protein → Incorrect.
• Option 3: Insulin is not a lipid (it’s a protein) → Incorrect.
• Option 4: Glycogen is a carbohydrate (polysaccharide), insulin is a protein (made of amino acids) → Correct.

Answer:

D. Glycogen is a carbohydrate, and insulin is a protein. (Note: Assuming the last option is labeled D; if the original options had labels like A - D with the last one as the correct, this is the correct choice.)