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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 3 main types of lipids. a. Neutral fats - make up adipose tissue in our bodies and functions as long term energy storage, insulates and protects. The unit molecules or monomers that make up neutral fats are fatty acids and glycerol. Neutral fats are composed of one glycerol molecule and 3 fatty acid chains. The diagram below shows the reaction that results in the formation of a neutral fat. X is glycerol, and Y represents the 3 fatty acid molecules.