AKMidTerm - Midterm Examination Fall 2007 Chemistry 114A...

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Midterm Examination Fall 2007 Chemistry 114A NAME: ID# Total points: Q #1 (60 pts) + Q #2 (60 pts) + Q #3 (60 pts) + Q #4 (20 pts) + Q #5 (70 pts) + Q #6 (60 pts) + Q #7 (40 pts) + Q #8 (80 pts) =450 Question #1: Please circle the single best answer for a-l. Total points (12 X 5)=60 a) In a solution of pH 10 A. arginine will be more negatively charged than glutamic acid. B. arginine will be more positively charged than glutamic acid. C. arginine and glutamic acid will carry the same net charge. D. none of the above b. Which of the following amino acid side chains can be modified? A. Alanine B. Glycine C. Proline D. Leucine E. Tryptophan c. Over what approximate pH ranges would glycine exhibit significant buffering activities? A. Only 5 to 8.5, B. Only 3 to 5, C. Only 8.5 to 10.5 D. Only 1 to 3 and 8.5 to 10.5, (give credit to this answer too) E. Only 1 to 5 and 8.5 to 10.5 d. Which amino acid side chain contains a nitrogen atom? A. Arginine B. Aspartate C. Methionine D. Leucine E. Serine e. At a pH more acidic than it's isoelectric point an amino acid will carry A. no ionic charge. B. a predominately positive charge. C. a predominately negative charge. D. a positive charge equal to the negative charge. E. None of above f. Which amino acid residue is least likely to be found on cores of globular proteins in aqueous solution? 1
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A. Glutamate B. Phenylalanine C. Valine D. Ala E. Leucine g. If two proteins are isoelectric at pH 7.6, they may be separated by electrophoresis if performed at A. pH 7.6. B. pH unequal to 7.6. C. pH 7.6 after denaturation of protein to expose buried charges. D. none of the above h. The side chain of which of the following amino acids is the weakest acid? A. Glutamate. B. Histidine. C. Arginine. D. Lysine. ( give credit ) E. Cysteine.
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