Topics•Fats and Oils- Triglycerides, Saturated and UnsaturatedFatty Acids•Phospholipids- Characteristics, Amphipathic moleculeConstituent of lipid bilayer•Carotenoids- Pigments•Steroids- Cholesterol, Hormones•Vitamins and Waxes
LipidsLipidsare nonpolar hydrocarbons: •Fats and oils—energy storage•Phospholipids—cell membranes•Carotenoids•SteroidsFats serve as insulation in animals, lipid nerve coatings act as electrical insulation, oils and waxes repel water, prevent drying.
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Fats and OilsFats and oils are triglycerides—simple lipids—made of three fatty acids and 1 glycerol.Glycerol: 3 —OH groups—an alcoholFatty acid: nonpolar hydrocarbon with a polar carboxyl group—carboxyl bonds with hydroxyls of glycerol in an ester linkage.