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20 - CHM 11500 Lecture 20 Reading sections 13.2 15.6 and...

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1 CHM 11500 Lecture 20 Reading: sections 13.2, 15.6, and DNA sequencing and finger printing, pp. 616- 617
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2 Exam 3 Elliot Hall of Music, 6:30 PM, Monday Nov. 14 Be there by 6:10 PM Bring PUID, pencils, non-programmable calculator, and seat location . The exam covers Lectures 15-20, Connect homework, learning objectives for those lectures, labs (Spectrophotometric Analysis and Where’s the Iron)
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3 Lipids: fats Fats are esters of carboxylic acids & glycerol CH 2 (OH)CH 2 (OH)CH 2 (OH) Palmitic acid
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4 Example of a saturated triglyceride Solid at room T Example of an unsaturated fat. Liquid at room T
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5 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. Stearic acid (saturated)
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6 Zero calorie fat: Olestra Glycerine Stearic acid Sucrose
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7 Carbohydrates (polysaccharides) Carbohydrates are the most abundant class of organic compounds found in living organisms. They originate as products of photosynthesis, an endothermic condensation of carbon dioxide and water requiring light energy and catalyzed by the pigment chlorophyll. n CO 2 + n H 2 O + energy --> C n H 2n O n + n O 2
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8 Carbohydrates Carbohydrates are found as Sugars Starches Structural material (cellulose), a component of ATP, recognition sites on cell surfaces, One of three essential components of DNA and RNA
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9 Small carbohydrate molecules: Sugars Preferred structural form may be that of a cyclic molecule -- five and six- membered rings are favored and may be joined into chains.
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