Choose the correct statement about biological waxes:

• A. They contain at least one steroid molecule.
• B. They are fatty acids bound to long chain alcohol molecules.
• C. They are extremely hydrophilic.
• D. They are made of 4 fused carbon ring molecules.

Answer: (B)

Verified step by step guidance

1. Understand the structure of biological waxes: Biological waxes are composed of long-chain fatty acids esterified to long-chain alcohols. This structure makes them hydrophobic and solid at room temperature.
2. Eliminate options that do not match the structure of biological waxes: Since biological waxes are not composed of steroids or fused carbon rings, eliminate options mentioning these structures.
3. Consider the hydrophobic nature of waxes: Biological waxes are not hydrophilic; they are hydrophobic due to their long hydrocarbon chains, which repel water.
4. Identify the correct statement: The statement that describes biological waxes as 'fatty acids bound to long chain alcohol molecules' accurately reflects their chemical structure.
5. Conclude with the correct understanding: Biological waxes are important for their protective and water-repellent properties in nature, such as in plant cuticles and animal coatings.