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The Structure and Function of Lipids Lipids are a diverse group of biological substances made up primarily of non-polar groups. As a result of their non-polar character, lipids typically dissolve more readily in non-polar solvents such as acetone, ether, chloroform, and benzene, than in water. This solubility characteristic is of extreme importance in cells because lipids tend to associate into non-polar groups and barriers, as in the cell membranes that form boundaries between and within cells. Besides having important roles in membranes, lipids are stored and used in cells as an energy source. Other lipids form parts of cellular regulatory mechanisms. Lipids link covalently with carbohydrates to form glycolipids and with proteins to form lipoproteins. There are three major classes of lipids: * Neutral lipids * Phospholipids, * and steroids Neutral Lipids Neutral lipids are commonly found in cells as storage fats and oils, are so called because at cellular pH, they...

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