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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.
Some examples of the types of lipids are: neutral, saturated, (poly/mono) unsaturated fats and oils (monoglycerides, diglycerides, triglycerides), phospholipids, sterols (steroid alcohols), zoosterols (cholesterol), waxes, and fat-soluble vitamins (vitamins A, D, E, and K).hospholipids are found in all cell membranes. Cholesterol Cholesterol is a steroid and they are built from 4 fused hydrocarbon rings. The hydrocarbon tail is connected to the steroid at one end, and a hydroxyl group is connected to the other end.