CH369 exam1f00 - CH 369Exam 1 September 26, 2000 NAME_ SS#_...

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CH 369—Exam 1 September 26, 2000 NAME__________________________ SS#_____________________________ 1. 10 pts_______ 2. 6 pts_______ 3. 4 pts_______ 4. 8 pts_______ 5. 10 pts_______ 6. 8 pts_______ 7. 10 pts_______ 8. 5 pts_______ 9. 5 pts_______ 10. 6 pts______ 11. 10 pts______ 12. 8 pts______ 13. 6 pts______ 14. 4 pts______ TOTAL ________________ Extra credit (3 pts)____________
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1. 10 pts. Match the following amino acids with a characteristic that BEST describes it (some characteristics will apply to more than one, choose the one that best describes or distinguishes it. An answer may be used more than once: A. Cys____ 1. absorbs UV light B. His____ 2. hydrophobic C. Ala____ 3. can be phosphorylated D. Arg____ 4. negative charge at pH 7 E. Ser____ 5. can form disulfide bridge F. Trp____ 6. acts as a buffer at pH 7 G. Asp____ 7. positive charge at pH 7 H. Gln____ 8. uncharged at pH 7, but hydrophilic I. Lys___ J. Gly___ 2. (6 pts) How would you prepare 1 liter of a 0.025 M phosphate buffer at pH 7.3 using K 2 HPO 4 (MW=174 g/mole) and a 2M solution of HCl? 3. (4 pts) What is the pH of the following solutions: a. 10 -5 M HCl b. 2.0 x 10 -8 M HCl What is the hydrogen ion concentration of the following materials: c. blood plasma, pH 7.4 d. orange juice, pH 3.5
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4. (8 pts) Indicate the level(s) of protein structure the following contribute to:
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CH369 exam1f00 - CH 369Exam 1 September 26, 2000 NAME_ SS#_...

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