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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.
There are three major groups of lipids: 1  Triglycerides include fats, oils, and waxes. 2  Phospholipids look just like lipids except that one of the fatty acid chains is replaced by a phosphate (âP0 4 3â) group (Figure 3). 3  Steroids are characterized by a backbone of four linked carbon rings (Figure 4).