Biomolecule classification check: Which one of the following sets consists entirely of lipids (i.e., members of the same macromolecular class)?

Introduction / Context:
Accurate classification of biomolecules underpins understanding of structure–function relationships in biochemistry. The question tests whether you can identify a set in which all members belong to the lipid family.

Given Data / Assumptions:

• Lipids include diverse hydrophobic or amphipathic molecules such as triacylglycerols (fats/oils), sterols, waxes, and fatty acids.
• Other classes include carbohydrates, nucleic acids, and proteins.

Concept / Approach:
Evaluate each set for internal consistency. A correct set must contain only lipids; any presence of a carbohydrate, nucleic acid component, or protein renders the set mixed and therefore incorrect for the prompt.

Step-by-Step Solution:

Verification / Alternative check:
Textbook definitions categorize lipids by solubility in nonpolar solvents and amphipathic nature; option C meets this criterion exclusively.

Why Other Options Are Wrong:

• A and E are carbohydrate-only sets.
• B includes a nonlipid (amino acids).
• D mixes nucleic acid components with an organelle.

Common Pitfalls:
Equating “oils” with non-lipid substances or assuming “nucleus” is a macromolecule; overlooking that “sterols” (e.g., cholesterol) are a lipid subclass.

Final Answer:
Oils, sterols, waxes, fats