Biology Test 3

Last update by Shanal on 10/31/2013
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In general, the hydrolysis of ATP drives cellular work by _____.

Answer:
releasing free energy that can be coupled to other reactions

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    Which of the following statements correctly describes some aspect of ATP hydrolysis being used to drive the active transport of an ion into the cell against the ion's concentration gradient?
    This is an example of energy coupling.
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    Much of the suitability of ATP as an energy intermediary is related to the instability of the bonds between the phosphate groups. These bonds are unstable because _____.
    the negatively charged phosphate groups vigorously repel one another and the terminal phosphate group is more stable in water than it is in ATP
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    When 1 mole of ATP is hydrolyzed in a test tube without an enzyme, about twice as much heat is given off as when 1 mole of ATP is hydrolyzed in a cell. Which of the following best explains these observations?
    In the cell, the hydrolysis of ATP is coupled to other endergonic reactions.
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    What best characterizes the role of ATP in cellular metabolism?
    The free energy released by ATP hydrolysis may be coupled to an endergonic process via the formation of a phosphorylated intermediate.
  • smiraclelynch
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    The formation of glucose-6-phosphate from glucose is an endergonic reaction and is coupled to which of the following reactions or pathways?
    the hydrolysis of ATP
  • smiraclelynch
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    A chemical reaction is designated as exergonic rather than endergonic when _____.
    the potential energy of the products is less than the potential energy of the reactants
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    Which of the following is changed by the presence of an enzyme in a reaction?
    the activation energy
  • smiraclelynch
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    What do the sign and magnitude of the ΔG of a reaction tell us about the speed of the reaction?
    Neither the sign nor the magnitude of ΔG have anything to do with the speed of a reaction.
  • smiraclelynch
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    How do enzymes lower activation energy?
    by locally concentrating the reactants
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    Which of the following statements about enzymes is true?
    Enzymes speed up the rate of the reaction without changing the DG for the reaction.
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    Which of the following statements about enzyme function is correct?
    Enzymes can lower the activation energy of reactions, but they cannot change the equilibrium point because they cannot change the net energy output.