LECTURE19 - LECTURE 19 11/3/2009 Finish Colligative...

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Unformatted text preview: LECTURE 19 11/3/2009 Finish Colligative Properties, Biochemistry Reading for this week: Biochemistry Interchapter, pp 497-512 ; page 473, A Closer Look Lab: Organic reactions, Chapter 8 HW as usual Chemistry and Biochemistry Where weve been: ionic and covalent bonding molecular shape intermolecular forces organic functional groups Where were going: Types of biochemical molecues Lipids and fats Sugars and carbohydrates Amino acids and proteins Nucleotides, DNA, and replication How bonding and IMFs determine shape How shape determines biological function Esters Replacing a O-H bond in an acid with a O-C bond produces an ester. Acid - Ester Lipids: fats Fats are esters of carboxylic acids & glycerine CH 2 (OH)CH(OH)CH 2 (OH) A saturated fat, no C=C double or triple An unsaturated fat, contains C==C double bonds Flipped structure AN Ester Fatty Acids A B C CPS Question #1 O OH Which is a trans fatty acid? 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....
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This note was uploaded on 02/21/2010 for the course CHEM 115 taught by Professor L during the Spring '02 term at Purdue University-West Lafayette.

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LECTURE19 - LECTURE 19 11/3/2009 Finish Colligative...

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