Lecture 20 - CHM 115 Lecture 20 Todays Lecture Reading was...

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1 CHM 115 Lecture 20 Today’s Lecture Reading was KTT: Pages 503 - 511 Biological Molecules Fats & Lipids Cell Membranes Nucleic Acids DNA and RNA Replication & Translation Next Lecture Review Pages: 503 - 511
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2 Lipids: Fats Flipped structure Fats are esters of carboxylic acids & glycerine CH 2 (OH)CH 2 (OH)CH 2 (OH)
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3 Cis- & trans- fatty acids Metabolic studies have shown that trans fats have adverse effects on blood lipid levels--increasing LDL ("bad") cholesterol while decreasing HDL ("good") cholesterol. This combined effect on the ratio of LDL to HDL cholesterol is double that of saturated fatty acids.3 Stearic acid (saturated)
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4 Zero calorie fat: Olestra Glycerine Stearic acid Sucrose
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5 Other Lipids: Cellular Membranes Cellular membranes are made of phospholipids. Like soaps, these molecules have an ionic/polar end and a long non-polar region. Hydrophobic: nonpolar Hydrophillic: polar
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6 Cellular Membrane Cellular membranes are composed of a phospholipid bilayer – with the polar side
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