CH369 exam1s04 - Multiple Choice 1 If you had a 4-amino...

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Multiple Choice 1. If you had a 4-amino acid oligopeptide and did not know its sequence, how many different sequences would be possible? Only amino acids of the types found in proteins are present in this oligopeptide. a. 256 b. 1.6 x 10 5 c. 3.2 x 10 6 d. 1.1 x 10 12 e. Not enough information given to answer the question 2. You have an experiment for which you want to keep the pH at or near 6.0. Which weak acid would be the best choice to use as a buffer? a. HOOCCH 2 CHOHCOO - / - OOCCH 2 CHOHCOO - (Ka = 5.5 x 10 -6 ) b. CH 3 COOH/CH 3 COO - (Ka = 1.8x 10 -5 ) c. C 6 H 5 COOH/C 6 H 5 COO - (Ka = 6.5 x 10 -5 ) d. H 2 CO 3 /HCO 3 - (Ka = 4.3 x 10 -7 ) e. HCOOH/HCOO - (Ka = 1.44 x 10 -4 ) 3. Which statement is not true of hydrogen bonding? a. It is a kind of dipole-dipole interaction. b. In water, hydrogen bonds are constantly being broken and reformed. In ice, hydrogen bonds are more stable. c. Hydrogen bonds are crucial for maintaining the structures of nucleic acids and proteins. d. The high melting and boiling points of water are due to the high number and strength of their hydrogen bonds. e. Water can form a maximum of two hydrogen bonds. 4. Which of the following amino acids has a basic side chain? a. Gln b. Ser c. Lys d. Asn e. Met 5. At high altitudes, what happens to BPG levels in the blood and what is the effect on the oxygen saturation curve of hemoglobin? a. BPG levels lower and the oxygen saturation curve shifts to the right. b. BPG levels rise and the oxygen saturation curve shifts to the left. c. BPG levels lower and the oxygen saturation curve shifts to the left. d. BPG levels rise and the oxygen saturation curve shifts to the right. e. BPG levels do not change and there is no effect on the oxygen saturation curve.
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6. Which statement is not true concerning the differences between myoglobin and hemoglobin? a. The oxygen saturation curve for myoglobin is a rectangular hyperbola and is a sigmoidal curve for hemoglobin. b. Oxygen saturation of hemoglobin is much higher than that of myoglobin at the oxygen concentration found in tissue capillaries. c. Oxygen binding by hemoglobin decreases with increasing pH, whereas oxygen binding of myoglobin remains the same. d. Hemoglobin can bind O 2 , H + , and CO 2 . Myglobin binds O 2 only. e. Hemoglobin displays cooperative oxygen binding characteristics while myoglobin does not. Credit given for either b or c or both. 7. According to the Bohr effect, increasing CO 2 concentration a. increases hemoglobin’s oxygen affinity. b. decreases hemoglobin’s oxygen affinity. c. increases myglobin’s oxygen affinity. d. decreases myglobin’s oxygen affinity. e. Two of the these answers are correct. 8. Both prokaryotes and eukaryotes contain a: a. nucleus and cell membrane b. cell membrane and mitochondria c. nucleus and ribosomes d. cell membrane and ribosomes e. none of the above 9. A water molecule is: a. polar b. charged c. hydrophilic d. a, b, and c e. a and c 10. The pH of a 10 -5 M KOH solution is: a. 11 b. 9 c. 8 d. 6 e. 5
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11. The higher the pKa, the
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This note was uploaded on 03/30/2010 for the course CH 369 taught by Professor Kbrowning during the Spring '07 term at University of Texas.

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CH369 exam1s04 - Multiple Choice 1 If you had a 4-amino...

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