midterm1Fall07 - Name_ 1 Chemistry & Biochemistry 153C Fall...

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Name__________________________ 1 Chemistry & Biochemistry 153C Fall 2007 1st MIDTERM EXAMINATION 19 October 2007 (80 points, 3 pages, 50 minutes) PLEASE READ EACH QUESTION VERY CAREFULLY! 1. (11 points total) (a) (6 points) Write out a balanced equation for the complete oxidation of Glycine to carbon dioxide, bicarbonate and ammonium ion. (part b) (5 points) Write out a balanced reaction that shows how the bicarbonate and ammonium ions generated in glycine oxidation can be converted into a product readily excreted by mammals. 2. (18 points total) The peptidoglycan layer of the bacterial cell wall contains D- amino acids, such as D-alanine and D-glutamate. D-alanine is synthesized by alanine racemase, a pyridoxal-phosphate (PLP) dependent enzyme. Show how this enzyme catalyzes the conversion of L- to D-alanine. Draw out the complete structure of substrate and product, and show the mechanism of this racemization step. Use appropriate types of arrows to indicate electron movements, and draw out resonance forms that would stabilize your proposed intermediates.
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This note was uploaded on 08/26/2011 for the course CHEMISTRY Chem 153C taught by Professor Cathyclarke during the Spring '11 term at UCLA.

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midterm1Fall07 - Name_ 1 Chemistry & Biochemistry 153C Fall...

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