Draw the structure of a cholesterol ester where cholesterol is esterified with palmitic acid. is this polar or nonpolar acid 2. Draw the strucutre of lecithin containing stearic  acid on carbon 1 and arachidonic acid on carbon 2 of glycerol. is this polar or nonpolar acid  3.Disccuss the medical sginificance of cholesterol , cholesterol ester,l ecithin and choline . 4. Give examples of phosphoglycerides and sphingolipids of biological importance .

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