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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 Lipids are a variety of organic molecules grouped together on the basis of their solubility in nonpolar solvents. Their varied biological functions include energy source, energy storage, cell membrane structural components, hormones, vitamins, vitamin adsorption, protection, and insulation. The spectrum of lipid functions can be condensed into the three broad areas of: 1. Storage of energy 2. Structure of cell membranes 3. Signal of chemical biological activities. The four main groups of lipids include: 1. Fatty acids (saturated and unsaturated) 2. Glycerides (glycerol-containing lipids) 3. Nonglyceride lipids (sphingolipids, steroids, waxes) 4.