8 Lipids Membranes Structure

8 Lipids Membranes Structure - Lipids/Structure Ch 5...

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Lipids/Structure Ch. 5 pp.74-77 “Life is the continuous adjustment of internal relations to external relations.” Herbert Spencer Amoeba proteus, a unicellular "protozoan" One of the large (100 um) soil amoebae
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I. Lipids In structure a mixed bag of non-polymeric hydrophobic molecules of diverse structures . Fats: Fatty acids: Cholesterol and steroids
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Some vitamins are lipids (also Vitamin D) You do not have to know these structures.
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A. Major functions of lipids: 1. Makes a large part of the cell’s ___________. (e.g. phospholipids and __________) Varying amounts of proteins also in membranes. 2. Store large amounts of ________. (e.g. fatty acids) Twice as much per gram than carbohydrate 3. Steroids are used as hormones (e.g. estrogen and testosterone mentioned before). These are not proteins but still are classified as hormones.
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Other supra-cellular functions for lipids are: A. Padding in animals. B. Insulation for homeothermic animals. C. Wrapping around neurons to prevent short circuits in nerve transmission.
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