Test_bank_for_lehninger_principles_of_biochemistry_8th_edition_by_davi

, Test Bank For Lehninger Principles Of Bioche
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mistry 8th Edition By David L. Nelson; Michael ’ ’ ’ ’ ’ ’ ’ ’


M. Cox All Chapters 1-28 LATES ’ ’ ’ ’ ’




A dynamic steady state results when
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A) a molecule stops being degraded
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B) an organism is at equilibrium with its surroundings
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C) there is no net energy transfer ’ ’ ’ ’ ’


D) the rate of intake or synthesis of a molecule equals th
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e rate of its disappearance. - ANSWER C
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If a chemical reaction starts with 1M concentrations each of
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reactants A and B and products C and D, under what conditio
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ns of K′eq and ΔG′° will the reaction proceed in
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the forward direction (ΔG′° = RT ln K′eq)?
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A) If K′eq is greater than 1 and ΔG′° is negative
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B) If K′eq is 0 and ΔG′° is negative
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C) If K′eq is negative and ΔG′° is negative
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D) If K′eq is less than 1 and ΔG′° is positive. - ANSWER
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A

Living cells and organisms ’ ’ ’


A) exchange energy but not matter with their s ’ ’ ’ ’ ’ ’ ’


urroundings.
B) exchange energy and material with their surroundings. ’ ’ ’ ’ ’ ’

,C) are closed systems ’ ’


D) are at equilibrium with their surroundings. - ANSWER
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B
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The standard free-
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energy changes of two sequential chemical reactions are addit
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ive only if
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A) the reactions share a common intermediate.
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B) each reaction has a negative ΔG′° ’ ’ ’ ’ ’


C) the overall (net) reaction has a postive ΔG′°.
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D) the exergonic reaction occurs first. - ANSWER A
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Which of the following has a thioester bond?
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A) PEP (phosphoenolpyruvate) ’


B) ATP
C) phosphocreatine
D) acetyl-CoA - ANSWER D ’ ’ ’’’’




What provides the energy for the synthesis in an RNA polymer?
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A) The transfer of an energy- ’ ’ ’ ’


rich ribonucleoside monophosphate to the polym
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er.
B) The hydrolysis of two anhydride bonds in ri
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bonucleoside triphosphates. ’


C) The transfer of the γ phosphate of a ribonucleoside
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triphosphate to the polymer. ’ ’ ’

, D) The transfer of an energy-
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rich ribonucleoside triphosphate to the polymer. -
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ANSWER B
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When a nucleophile attacks the α phosphorous atom of
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ATP, what kind of transfer occurs?
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A) pyrophosphoryl transfer ’


B) phosphoryl transfer ’


C) adenylyl transfer ’


D) adenosine transfer - ANSWER C ’ ’ ’ ’’’’




When dNTPs become depleted in the cell, which of the followi
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ng enzymes will regenerate dNTPs from dNDPs?
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A) nucleoside diphosphate kinase ’ ’


B) polyphosphate kinase ’


C) creatine kinase ’


D) adenylate kinase - ANSWER A ’ ’ ’ ’’’’




Which of the following enzymes can catalyze the conversion
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of AMP to ADP?
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A) nucleoside diphosphate kinase ’ ’


B) polyphosphate kinase ’


C) creatine kinase ’


D) adenylate kinase - ANSWER D ’ ’ ’ ’’’’




Conversion of NAD+ to NADH is accomplished by the addition o
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f