Which type of organic molecule stores energy and forms the fats in the body?

Which type of organic molecule stores energy and forms the fats in the body?

• A. Lipid
• B. Carbohydrate
• C. Protein
• D. Nucleic acid

Answer: (A)

Lipids store energy and form fats in the body. They store energy as triglycerides, which are made of a glycerol backbone attached to three fatty acids and packed in adipose tissue for long-term energy and insulation. Lipids yield more energy per gram than other macromolecules, about 9 kcal per gram, making them ideal for sustained energy storage. By contrast, carbohydrates mainly provide quick energy and are stored as glycogen with much less energy per gram; proteins are used for building and enzymes rather than primary energy storage; nucleic acids store genetic information. That combination—high-energy storage and fat formation—belongs to lipids.

Lipids store energy and form fats in the body. They store energy as triglycerides, which are made of a glycerol backbone attached to three fatty acids and packed in adipose tissue for long-term energy and insulation. Lipids yield more energy per gram than other macromolecules, about 9 kcal per gram, making them ideal for sustained energy storage. By contrast, carbohydrates mainly provide quick energy and are stored as glycogen with much less energy per gram; proteins are used for building and enzymes rather than primary energy storage; nucleic acids store genetic information. That combination—high-energy storage and fat formation—belongs to lipids.