Which class of biomolecules is primarily responsible for waterproofing in biological systems?

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

Answer: (A)

Verified step by step guidance

1. Understand the function of waterproofing in biological systems: Waterproofing prevents water from passing through surfaces, which is crucial for maintaining homeostasis and protecting organisms from dehydration.
2. Review the properties of lipids: Lipids are hydrophobic (water-repelling) molecules due to their long nonpolar hydrocarbon chains. This makes them ideal for waterproofing, as they do not mix with water.
3. Examine examples of lipids in waterproofing: Waxes, a type of lipid, are commonly found in biological systems such as the cuticle of plants and the feathers of birds, providing a waterproof barrier.
4. Compare lipids to other biomolecules: Proteins, nucleic acids, and carbohydrates are primarily involved in functions like catalysis, genetic information storage, and energy provision, respectively, and do not have hydrophobic properties suitable for waterproofing.
5. Conclude that lipids are the biomolecule class responsible for waterproofing in biological systems due to their hydrophobic nature and role in forming protective barriers.