2008 Midterm - Chemistry 223b Midterm, March 2008 Page 1 1....

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Chemistry 223b Midterm, March 2008 Page 1 1. Suppose Schrodinger owned a big, fluffy cat that appeared white 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) Green C) White D) Black E) Violet 2. Which one of the following molecules has the smallest HOMO-LUMO gap? A) B) C) D) E)
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Chemistry 223b Midterm, March 2008 Page 2 3. The spectral data produced by a UV-visible spectrometer is typically a plot of… A) Fluorescence as a function of time B) Fluorescence as a function of wavelength C) Absorbance as a function of wavelength D) Absorbance as a function of fluorescence E) Wavelength as a function of time 4. What is the non-radiative photophysical process indicated below? S 0 S 1 T 1 A) Phosphorescence B) Vibrational cooling C) Excitational cooling D) Internal conversion E) Fluorescence
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Chemistry 223b Midterm, March 2008 Page 3 5. The coloured form of the acid-base indicator phenolphthalein has two negative charges. Which one of A – E is NOT a correct resonance structure of the rest? A) O O O O B) O O O O C) O O O O D) O O O O E) O O O O
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Chemistry 223b Midterm, March 2008 Page 4 6. Which part of the cell uses an adenine residue to catalyze a nucleophilic acyl substitution reaction between a mixed anhydride and an amino group? A) Lysosome B) RNA polymerase C) Chymotrypsin D) ATP synthase E) None of the other answers are correct 7. Which two of the following are most likely to be found in the outer membrane of Gram-( ) bacteria? 1. Peptides 2. Carbohydrates 3. Lipids 4. Nucleic Acids A) 2 and 3 B) 2 and 4 C) 1 and 3 D) 1 and 2 E) 3 and 4
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Chemistry 223b Midterm, March 2008 Page 5 8. What is the predominant form of lysine at pH 12? A) H 2 NC H C CH 2 OH O 2 2 2 NH 2 B) H 3 H C 2 O 2 2 2 3 C) H 2 H C 2 O O 2 2 2 2 D) H 3 H C 2 O O 2 2 2 3 E) HN CH C 2 O O 2 2 2
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Chemistry 223b Midterm, March 2008 Page 6 9. Which one of the following statements about α -amino acids is NOT correct? A) Most natural amino acids have the L configuration and are S B) The pKa of the COOH group is higher than that of a normal carboxylic acid due to stabilization of the conjugate base by the α -amino group C) Amino acids are very soluble in acidic and basic solutions D) At neutral pH, they are usually not very soluble in water E) They are amphoteric 10. The tertiary structure of a protein refers to… A) The arrangement of the peptide into a β -sheet B) The presence of heme molecules bound to protein C) The interaction of protein subunits D) The way the protein folds over on itself E) The arrangement of the peptide into a α -helix 11. 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 NH 2 R' HO OH B) R NHR' C) O R 2 D) R NHR' E) R NHR' 2
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Chemistry 223b Midterm, March 2008 Page 7 12. Which one of the following statements is NOT correct regarding the use of HPLC for the determination of amino acid composition?
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This note was uploaded on 04/30/2011 for the course CHEMISTRY Chemistry taught by Professor Dr.felixlee during the Winter '11 term at UWO.

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2008 Midterm - Chemistry 223b Midterm, March 2008 Page 1 1....

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