Prelim 1 Fall07 - BioBM 330 Name...

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Unformatted text preview: BioBM 330 Name ____________________________ 1st Prelim Cornell ID#________________________ 27 September, 2007 Please do not lift this sheet until the signal is given! Please be certain that your exam contains a total of 12 pages! Please write your name on EACH page. We urge you not to get bogged down on any one question. If you do not see the point fairly quickly, go on to the other questions and come back if time permits. You may have two hours for the whole exam. 1. _________ (2) 10. _________ (6) 2. _________ (2) 11. _________ (3) 3. _________(12) 12. _________ (9) 4. _________ (3) 13. _________ (5) 5. _________ (2) 14. _________ (6) 6. _________ (4) 15. _________ (2) 7. _________ (6) 16. _________ (6) 8. _________ (3) 17. _________ (2) 9. _________ (7) 18. _________ (3) 19. _________ (5) Total _________________(88) pK values (25C) -COOH group 2.0 -NH 3 + group 9.0 Aspartic acid side chain 3.9 Glutamic acid side chain 4.3 Histidine side chain 6.0 Cysteine side chain 8.3 Tyrosine side chain 10.9 Lysine side chain 10.8 Arginine side chain 12.5 BioBM 330 prelim 1, Fall '07 Name: ___________________________ 2 1. (2 points) Using structures, write a balanced chemical equation for the hydrolysis of an ester. 2. (2 points) The pK of an acid is always: (Circle all correct answers) a. equal to the pH at which it carries a positive charge. b. equal to the pH at which it carries a negative charge. c. equal to the pH at which it carries no net electric charge. d. a function of the pH of the solution which contains the acid. e. equal to the pH at which it is half dissociated. 3. a. (4 points) Write the structure of asparagine at pH = 7.0. b. (2 points) Give the three letter abbreviation of an amino acid that has a side chain with each of the following properties. ___________________ non-polar ___________________ sulfur-containing, never charged (3 points) Give the one letter abbreviation of an amino acid that has a side chain with each of the following properties. ___________________ polar, never charged ___________________ negatively charged at pH 7 ___________________ ionizable, but uncharged at pH 7.0 c. (1 point) Name the amino acid that will have the strongest buffering power at pH 6. d. (2 points) Calculate the isoelectric point of aspartic acid. BioBM 330 prelim 1, Fall '07 Name: ___________________________ 3 4. a. (2 points) After a protein is synthesized, amino acids in a protein are sometimes modified. Name two ways in which they are commonly modified. are commonly modified....
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This note was uploaded on 04/06/2008 for the course BIOBM 3300 taught by Professor Blankenshi during the Fall '08 term at Cornell University (Engineering School).

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Prelim 1 Fall07 - BioBM 330 Name...

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