Exam1-07 - CH 369 Spring 2007 - Exam 1 Multiple Choice...

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CH 369 Spring 2007 - Exam 1 Multiple Choice Questions 1. The polar characteristic of water can primarily be attributed to a. its bent structure b. its interaction with other molecules c. its ability to quickly make and break hydrogen bonds d. the covalent bond between oxygen and hydrogen atoms e. none of the above 2. The pH of a sample of blood is 7.4, while gastric juice is pH 1.4. The blood sample has a. 0.189 times the [H + ] as the gastric juice. b. 5.29 times lower the [H + ] as the gastric juice. c. 6 times lower the [H + ] as the gastric juice. d. 6,000 times lower the [H + ] as the gastric juice. e. a million times lower the [H + ] as the gastric juice. 3. Cathepsin B is a protease used by the body to digest food in the stomach. At what pH would you expect this enzyme to have optimal activity? a. 0.8 b. 2.0 c. 5.4 d. 7.6 e. 9.2 4. A compound has a pKa of 7.4. To 100 mL of a 1.0 M solution of this compound at pH 8.0 is added 30 mL of 1.0 M hydrochloric acid. The resulting solution is pH a. 6.5 b. 6.8 c. 7.2 d. 7.4 e. 7.5 5. The oxygen atom of water can form how many hydrogen bonds? a. one b. two c. three d. four e. five 6. Fatty acids are capable of forming micelles or bilayers primarily due to a. the amphiphilic nature of fatty acids. b. the repulsion between the fatty acid polar head groups. c. the repulsion between the fatty acid hydrophobic tails. d. All of these are true. e. None of these are true.
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7. DNA sequencing depends upon the presence of a fluorescently labeled component in DNA chain elongation process. Which of the following components of this technique is labeled? a. the DNA template strand b. the DNA primer c. the DNA polymerase d. the dNTP’s e. the ddNTP’s 8. The following is which amino acid? a. Tyr b. Ser c. Val d. Thr e. Ile 9. The substrate used in Edman degradation of peptides reacts with a. positively charged amino acids b. negatively charged amino acids c. hydrophobic amino acids d. the N-terminal amino acid e. the C-terminal amino acid 10. What makes H 2 O a great biological solvent? a. Water is polar, highly interactive with other molecules, and has a high specific heat. b. Water is nonpolar, highly interactive with other molecules, and has a high specific heat. c. Water is polar, highly interactive with other molecules, and has a low specific heat. d. Water is polar, non-interactive with other molecules, and has a high specific heat. e. Water is polar, highly interactive with other molecules, and has a low specific heat.
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11. Which series of bonds are increasing in strength, relative to each other? a. ionic > covalent > van der Waals > hydrogen b. covalent > hydrogen > ionic > van der Waals c. van der Waals > hydrogen > ionic > covalent d. covalent > ionic > hydrogen > van der Waals e. covalent > ionic > van der Waals > hydrogen 12. The hydrophobic effect allows for the packing of greasy molecules such as lipids by water molecules. What major thermodynamic effect is responsible?
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Exam1-07 - CH 369 Spring 2007 - Exam 1 Multiple Choice...

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