ipids differ from the other classes of naturally occurring biomolecules (carbohy- drates, proteins, and nucleic acids)in that they are more soluble in non-to-weakly polar solvents(diethyl ether, hexane, dichloromethathan they are in water.they include a variety of structural types, a collection of which is introduced in this chapter. In spite of the number of different structural types, lipids share a common biosyn- thetic origin in that they are ultimately derived from glucose. During one stage of car- bohydrate metabolism, called glycolysis, glucose is converted to lactic acid. Pyruvic acid is an intermediate