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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.
Main Image: Phospholipids are a class of lipids and are a major component of all cell membranes as they can form lipid bi-layers. Phospholipids are a type of large group of organic compounds called âLipidsâ. Lipids are a broad group of naturally occurring molecules with fats, waxes, fat-soluble vitamins (such as vitamins A, D, E and K), phospholipids and others.