TEST2 - CHE 330-01 Exam #2 March12th, 2010 This examination...

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1 CHE 330-01 Exam #2 March12th, 2010 This examination is worth 100 points. Please mark (bubble) your answer on the sheet provided. GOOD LUCK ---------------------------------------------------------------- Multiple Choice: (3.5 points each) 1. What is the isoelectric point (pI) of the peptide below? D-A-N a. 6.35 b. 10.80 c. 5.40 d. 2.95 e. 4.75 2. The peptide below is capped at the carboxyl terminus as a methyl ester. That is the alpha- carboxyl group has been converted to a methyl ester. Calculate the net charge (consider major form) of this peptide at pH = 5.4. H-L-T-R a. +1 b. +2 c. +3 d. -2 e. -3 3. Which of the following does NOT account for the stability of the triple helix of collagen? a. leucine zipper b. inter-strand H-bonding c. dispersion forces among Ala side chains d. cross-linking involving Lys side chains e. H-bonding capabilities of 4-HyP 4. Which of the following molecules will have the lowest boiling point? a. the smallest ester b. the smallest ether c. the smallest alkane d. the smallest amide e. the smallest ketone 5. Which of the following statements is TRUE: a. The heme group has positively charged groups that interact with acidic amino acid side chains in Hb/Mb. b. The distal His in Hb/Mb forms a coordinate covalent bond with Fe 2+ in heme. c. Mb has a polar binding pocket for O 2 to allow it to bind to Fe 2+ d. The heme group has negatively-charged groups that interact with basic amino acid side chains in Hb/Mb. e. Water prevents the binding of O 2 to Hb/Mb because it oxidizes Fe 3+ to Fe 2+ . 6. Which of the following statements is TRUE about 2,3-Bisphosphoglycerate (2,3-BPG)? a. 2,3-BPG has a large positive charge and binds to the OXY form of hemoglobin b. 2,3-BPG enhances the affinity of hemoglobin for O 2 c. 2,3-BPG binds to the heme group of hemoglobin and O 2 is released. d.
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TEST2 - CHE 330-01 Exam #2 March12th, 2010 This examination...

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