Test1(1)

Test1(1) - BCH 4053 February 9, 2001 (10) 1. HOUR TEST 1...

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BCH 4053 February 9, 2001 HOUR TEST 1 NAME_____________________ (10) 1. Formic acid has a pK of 3.8. If formic acid were detected in the urine of a patient, and the urine had a pH of 4.5, what fraction of the formic acid would be protonated? (Note: I am asking for a fraction and not a ratio ). Page Points 1 ____ 2 ____ 3 ____ 4 ____ Total ______ (14) 2. Draw a titration curve for glutamic acid on the graph below. (a) Locate and identify the points on the curve corresponding to pK 1 , pK 2 , and pK 3 . (b) Calculate the approximate pI value and locate its position on the curve. (c) Indicate the pH region of the graph in which the side chain functional group is >90% charged. (8) 3. Underline the following peptides which are negatively charged at pH 7.0. Circle each amino acid which is aromatic . gln.val.tyr.ala lys.arg.glu.trp met.his.leu.asp cys.pro.gly.asn
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BCH 4053 --Hour Test 1 Page 2 Name________________________ (12) 4. You have a solution of 500 mL of 0.24 M acetate buffer with a pH of 4.8, which is the pK
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Test1(1) - BCH 4053 February 9, 2001 (10) 1. HOUR TEST 1...

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