test - July 18, 1999 ID number _ Biochemistry Cumulative...

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July 18, 1999 ID number _________ Biochemistry Cumulative Exam Consider this one a "freebie." The 50 questions on this exam came straight out of Zubay's Biochemistry textbook. Any self-respecting biochemist should be able to answer them (with some thought). Therefore, at least 75% of the questions must be answered correctly to pass this exam. No books, notes, or references of any kind may be used on this exam; it has been designed to test what you know. (If you do not pass it, then at least you will know what areas you need to review.) Good luck, K. Redding # answered correctly: _________ # answered incorrectly: _________ Grade: _________
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1. Each of the following subcellular structures contains DNA EXCEPT A. the nucleus. B. ribosomes. C. chloroplasts. D. mitochondria. 2. In plant and animal cells, the three-dimensional integrity of the cell is maintained, in part, by an internal network of filaments called A. the cell wall. B. the Golgi apparatus. C. the cytoskeleton. D. the endoplasmic reticulum. 3. Of the following, which are prokaryotes? A. viruses B. bacteria C. yeast D. plant cells 4. G ° for the conversion of glycerol-3-phosphate to glycerol + P i is -2.2 kcal/mole. Thus, you can conclude that A. this reaction will occur spontaneously. B. this reaction may or may not occur spontaneously, depending on the actual concentrations of reactants and products. C. this reaction will only occur spontaneously if it is coupled to another reaction that has a more favorable G ° . D. this reaction is so strongly favorable that it could be coupled to drive an otherwise unfavorable cell reaction. 5. In most biochemical reactions, PV is A. negligible B. positive C. negative D. dependent on E 6. According to the Second Law of Thermodymnamics, A. the total entropy change in any reaction that occurs spontaneously must be greater than 0. B. the total entropy change in any reaction that occurs spontaneously must be less than 0. C. the total entropy of the universe remains constant. D. the total entropy of the universe is always decreasing. 7. Which of the following is true? A. Liquid and solid water have the same number of hydrogen bonds per molecule of water B. Liquid water has more hydrogen bonds per molecule than does solid water C. Solid water has more hydrogen bonds per molecule than does liquid water D. Hydrogen bonding is a major factor in the structure of gaseous water E. None is true Page 1
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8. What is the pH of an aqueous solution that has a [OH - ] of 3.45 x 10 -5 M? A. 3.47 B. 4.47 C. 5.53 D. 9.54 E. none of the above 9. A peptide was found to have a molecular mass of about 650 and upon hydrolysis produced Ala, Cys, Lys, Phe, and Val in a 1:1:1:1:1 ratio.
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test - July 18, 1999 ID number _ Biochemistry Cumulative...

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