quiz3[1] - Name: _ 2008 Biochemistry Quiz 3 Multiple Choice...

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Name: ______________________ 1 2008 Biochemistry Quiz 3 Multiple Choice (11 questions: front and back of page) Identify the choice that best completes the statement or answers the question. Calculators are not required and not permitted for this quiz. 2. Which of the above stereoisomers is L-(2S,3S)-isoleucine? A. 1 B. 4 C. 2 D. 3 E. none p H = p Ka + log [ A ] [ HA ] 3. Acetic acid has a p Ka of 4.76 at 25ºC. What is the p H of a solution containing 100 mM acetic acid and 10 mM sodium acetate (the conjugate base of acetic acid)? A. p H = 4.76 B. p H = 2.76 C. p H = 6.76 D. p H = 3.76 E. p H = 5.76 4. What is the isoelectric point of a pentapeptide sequence below (use pKa values as indicate)? (9.21) (6.00) (10.53) (1.83) NH 3 + -Met-His-Ala-Lys-Phe-COO - A. 3.92 B. 9.87 C. 7.61 D. 6.00 E. 9.21 5. How does myoglobin increase binding specificity for oxygen versus carbon monoxide? A. oxygen binds in a bent conformation forming a hydrogen to the distal His E7 B. free heme molecules bind selectively to oxygen rather than carbon monoxide
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quiz3[1] - Name: _ 2008 Biochemistry Quiz 3 Multiple Choice...

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