Glycolipids, different amides derived from sphingosine, contain polar carbohydrate groups on cell surfaces the carbohydrate portion is recognized by and connects to intracellular messengers.Sphingomyelins, amides derived from an amino alcohol (sphingosine), also contain charged phosphate diester groups they are essential to the structure of cell membranes and are abundant in nerve cell membranes.Together with other lipids, they help to control the flow of molecules into and out of cells. Glycerophospholipids are triesters of glycerol that contain charged phosphate diester groups and are abundant in cell membranes. They are a major source of biochemical energy. They make up the fats stored in our bodies and most dietary fats and oils. Triacylglycerols are carboxylic acid triesters of glycerol, a three-carbon trialcohol. Waxesare carboxylic acid esters, RCOOR’,with long, straight hydrocarbon chains in both R groups they are secreted by sebaceous glands in the skin of animals and perform mostly external protective functions.Fatty acid: A long-chain carboxylic acid those in animal fats and vegetable oils often have 12–22 carbon atoms.Lipid: A naturally occurring molecule from a plant or animal soluble in nonpolar organic solvents.

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