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Lipid is the collective name for fats, oils, waxes and fat-like molecules (such as steroids) found in the body. protection, waterproofing, insulation and buoyancy agents. The basic unit of lipids is a triglyceride, synthesised from glycerol (propane-1,2,3-triol) and fatty acids. Glycerol is a type of alcohol. Alcohols are organic compounds. Their molecules are characterised by hydroxyl groups, -OH. Glycerol is a trihydric alcohol, which means each molecule has three hydroxyl groups.
Similarities. Triglycerides and phospholipids are both lipid derivatives of glycerol, which is a three-carbon molecule with three attached hydroxyl groups. The oxygen atoms of the three hydroxyl groups are readily reactive, and cells utilize this reactivity to synthesize both classes of lipids.riglycerides and phospholipids both contain long-chain fatty acids attached to one or more of the glycerol molecule's hydroxyl groups. Both classes of lipids can utilize the same types of fatty acid chains, in terms of both length and saturation.