Biochemistry 2280A Lecture Notes - Lecture 6: Lipid Bilayer, Sphingosine, Glycerophospholipid

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Biological molecules that have little or no solubility in water. Functions: structural components of biological membranes, energy storage molecules, enzyme cofactors, signalling molecules, pigments. Describe and distinguish between different classes of lipids. Explain the biological roles of the different classes of lipids. Hydrocarbon chains ending in a carboxylic acid group. Saturated hydrocarbon chain with no double bonds. Monounsaturated hydrocarbon chain has one double bond: 1 unit of unsaturation = 1 double bond (or 1 ring) Polyunsaturated hydrocarbon chain has two or more double bonds. Number of carbon atoms and double bonds in the fatty acid are separated by a colon: saturated fatty acid with 16 carbons would be represented 16:0. Glycerol is a three-carbon molecule with hydroxyl groups at each carbon. Triglycerides are obtained by attaching a fatty acid to each hydroxyl of glycerol via an ester linkage. Used to store fatty acids as energy reservoirs in adipocytes (fat cells)

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