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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 are molecules defined by several characteristics, the chief of which is their avoidance of water -- referred to as their nonpolar nature. Lipids are then divided into two categories. One category contains molecules that are long chains of carbon atoms accompanied by hydrogen atoms, such as fatty acids. The other category is molecules in which carbon atoms are attached as multiple ring structures that are fused together, such as cholesterol.