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CW33-AA - CHM 2046/Myers Class Worksheet 33 April 7 2010...

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CHM 2046/Myers Class Worksheet 33 April 7, 2010 AMINO ACIDS AND POLYPEPTIDES 1. Optical Isomers occur where there is a chiral carbon (one with 4 different groups). Circle the chiral carbons. How many total isomers are there for each structure? H H H H O H H O CH 3 C C CH 3 CH 3 C C H H O C C C C O H HO Cl HO H HO OH _____ _____ _____ 2. Amino acids are the monomers used to form polypeptides and proteins. They exist in water mostly as the zwitterion. O O H 2 N CH 2 C O H H 3 N CH 2 C O glycine = gly There are 20 common α -amino acids found in most living species. All but glycine have optical isomers. See text Figure 15.20 on p 496. Only the “l” isomer is biologically active in our ecosystem. alanine = ala cystine = cys aspartic acid = asp Amino acids and the polypeptides and proteins formed from these are habitually shown with the amine group on the left and the carboxyl group on the right .
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