test1 - BCH 4053 June 1 2001 Points(5 1 HOUR TEST 1 NAME...

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BCH 4053 June 1, 2001 Points HOUR TEST 1 NAME_____________________ (5) 1. List five unusual properties of water resulting from its hydrogen bonded structure. Page Points 1 ____ 2 ____ 3 ____ 4 ____ 5 ____ Total ______ (5) 2. Draw a diagram to show how water will interact with an amphipathic molecule such as sodium palmitate. What is the name for the structure assumed by the sodium palmitate in water? (12) 3. You have a solution of 300 mL of 0.30 M acetate buffer with a pH of 4.0. The pK of acetic acid is 4.8. To this solution you add 20.0 mL of 1.0 M sodium hydroxide. What is the final pH of the solution? (Show your work).
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Page 2 Name________________________ (10) 4. A glutamic acid side chain residue of the enzyme lysozyme is found in a hydrophobic environment, and has a pK of 6.3. (a) What is the normal pK for a glutamic acid side chain, and why would the hydrophobic environment cause this change? (b) What fraction of this side chain will be protonated at pH 7.0? (14) 5. Draw a titration curve for lysine 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
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This note was uploaded on 05/22/2011 for the course BCH 4053 taught by Professor Logan during the Fall '06 term at FSU.

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test1 - BCH 4053 June 1 2001 Points(5 1 HOUR TEST 1 NAME...

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