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Bio 2 Test

28 Questions  I  By Dentalbio
Bio 2 test
Chapters 5-8

  
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1.  How do cells use the ATP cycle shown in the figure?
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2.  Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the ratio of succinate to malonic reduces the inhibitory effect of malonic acid. Based on this information, which of the following is correct?
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3.  Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the ratio of succinate to malonic reduces the inhibitory effect of malonic acid. What is malonic acid's role with respect to succinate dehydrogenase?
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4.  A series of enzymes catalyze the reaction X->Y->Z->A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. What is substance X?
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5.  A series of enzymes catalyze the reaction X->Y->Z->A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme. With respect to the enzyme that converts X to Y, substance A functions as?
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6.  Choose the pair of terms that correctly completes this sentence: Catabolism is to anabolism as __________ is to __________.
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7.  Most cells cannot harness heat to perform work because
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8.  Which of the following metabolic processes can occur without a net influx of energy from some other process?
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9.  If an enzyme in solution is saturated with substrate, the most effective way to obtain a faster yield of products is to
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10.  Some bacteria are metabolically active in hot springs because
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11.  If an enzyme is added to a solution where its substrate and product are in equilibrium, what will occur?
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12.  Which of the following is the smallest closed system
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13.  Which of the following is true of metabolism in its entirety in all organisms
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14.  The mathematical expression for the change in free energy of a system is ^G = ^H - T^S. Which of the following is (are) correct?
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15.  A system at chemical equilibrium
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16.  Which of the following is true for all exergonic reactions?
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17.  Chemical equilibrium is relatively rare in living cells. Which of the following could be an example of a reaction at chemical equilibrium in a cell?
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18.  Which of the following shows the correct changes in thermodynamic properties for a chemical reaction in which amino acids are linked to form a protein?
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19.  When glucose monomers are joined together by glycosidic linkages to form a cellulose polymer, the changes in free energy, total energy, and entropy are as follows:
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20.  A chemical reaction that has a positive ^G is correctly described as
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21.  Which of the following best describes enthalpy (H)
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22.  22) For the hydrolysis of ATP to ADP +P i, the free energy change is -7.3 kcal/mol under standard conditions (1 M concentration of both reactants and products). In the cellular environment, however, the free energy change is about -13 kcal/mol. What can we conclude about the free energy change for the formation of ATP from ADP and P i under cellular conditions?
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23.  When 10,000 molecules of ATP are hydrolyzed to ADP and i in a test tube, about twice as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation?
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24.  Which of the following statements is true concerning catabolic pathways?
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25.  When chemical, transport, or mechanical work is done by an organism, what happens to the heat generated?
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26.  When ATP releases some energy, it also releases inorganic phosphate. What purpose does this serve (if any) in the cell?
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27.  29) A number of systems for pumping ions across membranes are powered by ATP. Such ATP-powered pumps are often called ATPases although they don't often hydrolyze ATP unless they are simultaneously transporting ions. Because small increases in calcium ions in the cytosol can trigger a number of different intracellular reactions, cells keep the cytosolic calcium concentration quite low under normal conditions, using ATP-powered calcium pumps. For example, muscle cells transport calcium from the cytosol into the membranous system called the sarcoplasmic reticulum (SR). If a resting muscle cell's cytosol has a free calcium ion concentration of 10-7 while the concentration in the SR is 10-2, then how is the ATPase acting?
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28.  Which of the following statements is true about enzyme-catalyzed reactions?
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