Exam 1 - Fall08

Exam 1 - Fall08 - BCH 3023 Fall 2008 Exam 1, Form A Name: _...

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BCH 3023 – Fall 2008 Exam 1, Form A 1 Name: _________________________________ 1. At what pH is the total net charge of lysine equal +1½? For lysine, the pK a for the α -carboxylate is 2.2, the pK a for the α -amino group is 8.9, and the pK a for the ε -amino group is 10.5. a. 2.2 b. 5.6 c. 7.5 d. 9.7 e. 11.1 2. The most important contribution to the stability of a protein’s conformation appears to be the: a. entropy increase from the decrease in ordered water molecules forming a solvent shell around it . b. maximum entropy increase from ionic interactions between the ionized amino acids in a protein. c. sum of free energies of formation of many weak interactions between its polar amino acids and surrounding water. d. sum of free energies of formation of many weak interactions between its polar amino acids and surrounding water. e. stabilizing effect of hydrogen bonding between the carbonyl group of one peptide bond and the amino group of another. 3. Which of the following aqueous solutions has the highest pH? a. 100 mM HCl b. 100 mM NH 4 Cl (pK a = 9.25) c. 100 mM acetic acid (pK a = 4.86) d. 100 mM formic acid (pK a = 3.78) e. 100 mM NaOH 4. Humans maintain a nearly constant level of hemoglobin by continually synthesizing and degrading it. This an example of a(n): a. waste of energy. b. exergonic change. c. dynamic steady state. d. equilibrium state e. free-energy change.
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BCH 3023 – Fall 2008 Exam 1, Form A 2 5. What volume of 7.5 M KOH must be added to 1.0 liter of 100 mM glycine at pH 9.0 0 to bring its pH to exactly 10.0?
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Exam 1 - Fall08 - BCH 3023 Fall 2008 Exam 1, Form A Name: _...

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