Which group of organic molecules serves as long-term energy storage and waterproof coverings?

• A. Carbohydrates
• B. Proteins
• C. Lipids
• D. Nucleic acids

Answer: (C)

Lipids are the group that serves as long-term energy storage and waterproof coverings. Fats and oils store a lot of chemical energy in their long hydrocarbon chains, giving them much more energy per gram than carbohydrates, which makes them ideal for lasting energy reserves. Because lipids are nonpolar and hydrophobic, they form water-repellent barriers, such as waxy coatings on leaves and the waterproofing in skin and fur. While carbohydrates provide quick energy and some structural support, proteins have varied roles and aren’t mainly for long-term energy storage or waterproofing, and nucleic acids store genetic information rather than energy or waterproofing properties.