Triacylglycerol is composed of?

• A. Three Fatty Acids and Glycerol
• B. Glycerol Only
• C. One Fatty Acid and Glycerol
• D. Phospholipid and Glycerol

Answer: (A)

Triacylglycerol is a storage lipid formed when three fatty acid molecules are esterified to a glycerol backbone. The glycerol has three hydroxyl groups, and each can form an ester bond with a fatty acid, giving three fatty acids attached to glycerol. That arrangement makes triacylglycerol highly energy-dense and non-polar, ideal for fat storage.

Glycerol alone lacks fatty acids, so it wouldn’t be a triacylglycerol. If only one fatty acid attached to glycerol, you’d have a monoacylglycerol, not triacylglycerol. A compound described as phospholipid and glycerol would involve a phosphate group, not just three fatty acids on glycerol, so that’s not triacylglycerol.