2009 Final - Chemistry 2223b Final Exam, 2009 Page 1 1....

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Chemistry 2223b Final Exam, 2009 Page 1 1. Suppose Schrodinger owned a big, fluffy cat that appeared black under sunlight. If the cat was placed in a room that was illuminated with only green light, what colour would the cat appear? A) Red B) Black C) Violet D) Green E) White 2. How many of the photophysical processes listed below change the magnetic properties of a molecule (i.e. from diamagnetic to paramagnetic, or from paramagnetic to diamagnetic)? Absorption Vibrational cooling Fluorescence Intersystem crossing A) None B) 4 C) 2 D) 3 E) 1 3. The outer membrane of Gram-negative bacteria is primarily composed of… A) Peptidoglycan B) Lipopolysaccharide C) Glycoprotein D) Nucleic acid E) Mucopolysaccharide
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Chemistry 2223b Final Exam, 2009 Page 2 4. 1.5 mol of HCl were added to 1.0 mol of disodium aspartate dissolved in distilled water. The resulting solution contains an approximately equal concentration of which two structures? COO H 2 N COO COO H 3 N COO COO H 2 N COOH COO H 3 N COOH COOH H 3 N COO COOH H 2 N COO COOH H 2 N COOH I II III IV VV I V I I COOH H 3 N COOH VIII A) III and IV B) V and VI C) VI and VIII D) V and VII E) II and III
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Chemistry 2223b Final Exam, 2009 Page 3 5. Both the protonated and unprotonated forms of the imidazole group of histidine can be detected by UV-visible spectroscopy. If histidine was dissolved in a buffer, and measurements indicated that 50% of the imidazole groups were protonated, what is the approximate pH of the buffer? A) 3 B) 10 C) 14 D) 6 E) 2 6. Which one of A – E is least likely to be involved in the mechanism of the following reaction? O R NHR' H + /H 2 O RCOOH + H 3 NR' A) R NHR' HO OH 2 B) R NHR' C) R NH 2 R' D) O R 2 E) R NHR'
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Chemistry 2223b Final Exam, 2009 Page 4 7. A mixture of amino acids, predominantly in the net-charge forms listed below, was injected into an HPLC chromatography column consisting of a hydrophobic stationary phase with quaternary ammonium groups (see diagram). Predict the order of elution of the amino acids, from first to last. N N stationary phase material Lysine (net charge of positive one) Alanine (net charge of zero) Glycine (net charge of zero) Leucine (net charge of zero) Aspartic acid (net charge of negative one) mixture of amino acids: first last A) Aspartic acid Leucine Alanine Glycine Lysine B) Glycine Leucine Aspartic acid Lysine Alanine C) Lysine Glycine Alanine Leucine Aspartic acid D) Lysine Leucine Alanine Glycine Aspartic acid E) Aspartic acid Alanine Glycine Leucine Lysine
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Chemistry 2223b Final Exam, 2009 Page 5 8. What is the purpose of DCC in peptide synthesis? A) It protects the carboxylic acid and prevents it from reacting B) It converts the carboxylic acid into a more-reactive acid derivative C) It assists in the protection of the amino group D) It protects the side chains of the amino acids from reacting E) It converts the amino group into a better nucleophile 9. In which reaction is the starting material behaving in a prochiral manner?
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2009 Final - Chemistry 2223b Final Exam, 2009 Page 1 1....

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