Sas-finalpractice - CHEM 239B Spring, 2006 Prof. Sasaki...

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CHEM 239B Spring, 2006 FINAL EXAM Name . Prof. Sasaki 175 points TOTAL Good Luck! Note: Only answers in the box will be graded. ______________________________________________________________________ 1. (35) The following structure is drawn in an unconventional manner. CH 2 CH COOH N H C O CH N H C O CH 2 NH 2 CH 2 CH 2 C O NH 2 HOOC peptide 1 (a) Label the N-terminus and the C-terminus. (b) Circle all the peptide bonds. (c) The following reaction was carried out with the above peptide 1 . Draw the structures of the products. peptide 1 F NO 2 NO 2 6N HCl 110•C 24hrs products
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CHEM 239B page 2 Name . 2. (a) Which amino acid has the highest isoelectric point, glutamine, glutamic acid or lysine? H 2 N CO 2 H R glutamine : R = CH 2 CH 2 CONH 2 glutamic acid : R = CH 2 CH 2 CO 2 H lysine R = CH 2 CH 2 CH 2 CH 2 NH 2 (b) Lysine has three ionizable groups with the following pKa values ; pKa ( α− CO 2
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Sas-finalpractice - CHEM 239B Spring, 2006 Prof. Sasaki...

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