A triglyceride is formed when glycerol combines with three fatty acids by
Correct answer: B. condensation, forming ester bonds and releasing three molecules of water
- A. hydrolysis, forming glycosidic bonds
- B. condensation, forming ester bonds and releasing three molecules of water
- C. oxidation, forming peptide bonds
- D. reduction, forming hydrogen bonds
Explanation
Each of the three hydroxyl groups of glycerol reacts with the carboxyl group of a fatty acid, so three ester bonds form and three water molecules are released. Digestion reverses this by hydrolysis, adding water back and freeing the fatty acids and glycerol for absorption. Glycosidic bonds join sugars and peptide bonds join amino acids, so neither term applies to a lipid.
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About Lipids
Lipids include fats, oils, waxes, phospholipids and steroids, which are largely insoluble in water and soluble in organic solvents. Coverage includes glycerol and fatty acids, ester bond formation, saturated and unsaturated fats, triglyceride functions, and phospholipids in cell membranes.
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