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The important class of lipids called steroids are actually metabolic derivatives of terpenes, but they are customarily treated as a separate group. Steroids may be recognized by their tetracyclic skeleton, consisting of three fused six-membered and one five-membered ring, as shown in the diagram to the right.
Lipids consist of a glycerol molecule linked with at least one and a maximum of three fatty acids. Lipids are molecules which contain a glycerol molecule, a carbohydrate, and at least one fatty acid. Glycerol has three OH groups, which allow fatty acids - which have a COOH group - to link to them with a condensation reaction. A condensation reaction is a reaction between an OH group and a COOH group, which links the two molecules together, splitting off a molecule of water: RâCOOH+HOâRâRâCOCâR+H2O.