Question

a student is given a list of molecules: glucose, cholesterol, starch, and hemoglobin. which one is a lipid and why? starch, because it stores energy. hemoglobin, because it is a protein. cholesterol, because it is a lipid molecule. glucose, because it is a sugar.

Explanation:

To determine which molecule is a lipid, we analyze each option:

• Starch is a carbohydrate (polysaccharide) used for energy storage, not a lipid.
• Hemoglobin is a protein (carries oxygen), not a lipid.
• Cholesterol is a type of lipid (steroid lipid) that is part of cell membranes and involved in various functions.
• Glucose is a monosaccharide (simple sugar, a carbohydrate), not a lipid.

So the correct one is Cholesterol, because it is a lipid molecule.

Answer:

Cholesterol, because it is a lipid molecule.