Prostaglandin is a hormone derived from what type of compound?

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

Answer: (B)

Prostaglandins are signaling molecules that come from lipids, specifically from fatty acids. They are formed from arachidonic acid, a polyunsaturated fatty acid in cell membranes. When cells need prostaglandins, arachidonic acid is released and converted by enzymes into the prostaglandins. Because they originate from lipid structures, prostaglandins are classified as lipid-derived molecules rather than proteins, carbohydrates, or nucleic acids. This lipid origin also helps explain their local signaling role and short-range effects in inflammation, fever, and smooth muscle regulation.