fall05_oldexam3 - BIO 311c Introductory Biology I OLD EXAM...

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BIO 311c Introductory Biology I K. Sathasivan OLD EXAM 3 Read each question carefully before you select the best answer for questions 1-52 and fill in the appropriate blank in the scantron form with a #2 pencil. Each question is worth 2.0 points. Answer all the 52 questions. The best 50 questions will be considered for a maximum of 100 points. Metabolism 1) Anabolic pathways A) consume energy to build up polymers from monomers. B) are normally exergonic C) are always exothermic D) release energy as they degrade polymers to monomers. E) all the choices are correct. 2) According to the first law of thermodynamics, A) some special people can create things out of thin air B) the universe loses energy because of friction. C) matter can be neither created nor destroyed. D) all processes increase the entropy of the universe. E) energy is neither created nor destroyed. 3) The mathematical expression for the change in free energy of a system is: G = H - T S . Which of the following is incorrect? A) G is negative for exergonic reactions. B) T is the absolute temperature. C) H is the change in heat. D) S is the change in entropy. E) G is always negative at high temperatures. 4) Which of the following statements regarding enzymes is true ? A) Enzymes decrease the rate of a reaction. B) Enzymes prevent changes in substrate concentrations. C) Enzymes are permanently altered by the reactions they catalyze. D) Enzymes increase the rate of reaction. E) Enzymes change the direction of chemical reactions. 5) The active site of an enzyme is the region that A) binds with the NTP. B) binds with the substrate. C) is inhibited by a coenzyme or a cofactor. D) binds with allosteric inhibitors. E) none of the above 6) Ethanol is given as an antidote to methanol poisoning. Methanol is converted by the enzyme alcohol dehydrogenase (ADH) to formaldehyde and ethanol is converted to acetaldehyde by ADH. What could be the possible mechanism of this antidote effect? A) methanol coverts ethanol and makes it less toxic and then eliminated through urine B) ethanol coverts methanol and makes it less toxic and then eliminated through urine C) ADH is inhibited by ethanol and then stops working to make acetaldehyde D) ADH is inhibited by methanol and then stops working to make formaldehyde E) Ethanol competes out methanol as the substrate preferred by the enzyme
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BIO 311c Old Exam 3 K. Sathasivan 2 7) Which of the following would decrease the entropy within a particular system? A) ATP hydrolysis in the muscle cells B) burning of fossil fuels to drive the car to school C) digestion of the food you had prior to the exam D) generation of fat from the increased consumption of simple sugars E) aerobic respiration to make ATP 8) When glucose monomers are joined together by glycosidic linkages to form a cellulose polymer, the changes in free energy, enthalpy, and entropy are as follows: A) - G, - H, - S B ) - G, + H , + S C) + G, + H, + S
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This note was uploaded on 03/19/2008 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas at Austin.

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fall05_oldexam3 - BIO 311c Introductory Biology I OLD EXAM...

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