Which statement best describes prostaglandin in the context of biomolecules?

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

Answer: (B)

Prostaglandins are signaling molecules derived from fatty acids, fitting squarely into the lipid family. They come from arachidonic acid through enzymatic pathways like the cyclooxygenase (COX) route and function as local mediators to regulate inflammation, pain, fever, blood flow, and smooth muscle activity. Their origin and properties align with lipids rather than proteins, carbohydrates, or nucleic acids, which are built from amino acids, sugars, and nucleotides, respectively. So labeling prostaglandins as lipids best reflects their chemical nature and role in biology.