Which type of macromolecule is primarily used for insulation in animals?

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

Answer: (C)

Verified step by step guidance

1. Understand the function of insulation in animals: Insulation helps maintain body temperature by reducing heat loss, which is crucial for survival in cold environments.
2. Review the primary macromolecules and their functions: Carbohydrates are mainly used for energy storage and quick energy. Proteins are involved in structural support, enzymatic activity, and other cellular functions. Nucleic acids store and transmit genetic information. Lipids, on the other hand, are hydrophobic molecules that serve as long-term energy storage and are excellent insulators due to their ability to trap heat.
3. Focus on lipids: Lipids include fats, oils, and waxes. They are stored in adipose tissue in animals, which provides insulation by forming a layer under the skin that reduces heat loss.
4. Consider examples in nature: Animals like whales and seals have thick layers of blubber (a type of lipid-rich tissue) that help them survive in cold aquatic environments by insulating their bodies.
5. Conclude that lipids are the macromolecule primarily used for insulation in animals, as their structure and properties make them ideal for this function.