Ch. 13 Lehninger biochem test bank
h h h h h
1.hIfhthehdeltahG'°hofhthehreac onhAh-->hBhish-40hkJ/mol,hunderhstandardhcondi onshthehreac on:h
A)hishathequilibrium.h
B)hwillhneverhreachhequilibrium.h
C)hwillhnothoccurhspontaneously.h
D)hwillhproceedhathahrapidhrate.h
E)hwillhproceedhspontaneouslyhfromhAhtohB.h-hE
Forhthehreac onhAh--->B,hdeltahG'°h=h-
60hkJ/mol.hThehreac onhishstartedhwithh10hmmolhofhA;hnohBhishini allyhpresent.hA erh24hhours,hanalysishrev
ealshthehpresencehofh2hmmolhofhB,h8hmmolhofhA.hWhichhishthehmosthlikelyhexplana on?h
A)hAhandhBhhavehreachedhequilibriumhconcentra ons.h
B)hAnhenzymehhashshi edhthehequilibriumhtowardhA.h
C)hBhforma onhishkine callyhslow;hequilibriumhhashnothbeenhreachedhbyh24hhours.h
D)hForma onhofhBhishthermodynamicallyhunfavorable.h
E)hThehresulthdescribedhishimpossible,hgivenhthehfacththatG'°hish-60hkJ/mol.h-hC
Thehreac onhAh+hBh--->ChhashahdeltahG'°hofh-
20hkJ/molhath25°hC.hStar nghunderhstandardhcondi ons,honehcanhpredicththat:
A)hathequilibrium,hthehconcentra onhofhBhwillhexceedhthehconcentra onhofhA.h
B)hathequilibrium,hthehconcentra onhofhChwillhbehlesshthanhthehconcentra onhofhA.h
C)hathequilibrium,hthehconcentra onhofhChwillhbehmuchhgreaterhthanhthehconcentra onhofhAhorhB.h
D)hChwillhrapidlyhbreakhdownhtohAh+hB.h
E)hwhenhAhandhBharehmixed,hthehreac onhwillhproceedhrapidlyhtowardhforma onhofhC.h-hC
, Whichhofhthehfollowinghcompoundshhashthehlargesthnega vehvaluehforhthehstandardhfree-
energyhchangeh(G'°)huponhhydrolysis?h
A)hAce chanhydrideh
B)hGlucoseh6-phosphateh
C)hGlutamineh
D)hGlycerolh3-phosphateh
E)hLactoseh-hA
Forhthehfollowinghreac on,hdeltahG'°h=h+29.7hkJ/mol.
L-Malateh+hNAD+h--->oxaloacetateh+hNADHh+hH+
Thehreac onhashwri en:h
A)hcanhneverhoccurhinhahcell.h
B)hcanhoccurhinhahcellhonlyhifhithishcoupledhtohanotherhreac onhforhwhichhdeltahG'°hishposi ve.h
C)hcanhoccurhonlyhinhahcellhinhwhichhNADHhishconvertedhtohNAD+hbyhelectronhtransport.h
D)hcannothoccurhbecausehofhitshlargehac va onhenergy.
E)hmayhoccurhinhcellshathsomehconcentra onshofhsubstratehandhproduct.h-hE
Forhthehreac onhAh---
>B,hthehKeq'hish104.hIfhahreac onhmixturehoriginallyhcontainsh1hmmolhofhAhandhnohB,hwhichhonehofhthehfollo
winghmusthbehtrue?h
A)hAthequilibrium,htherehwillhbehfarhmorehBhthanhA.h
B)hThehratehofhthehreac onhishveryhslow.h
C)hThehreac onhrequireshcouplinghtohanhexergonichreac onhinhorderhtohproceed.
D)hThehreac onhwillhproceedhtowardhBhathahveryhhighhrate.h
E)hDeltahG'°hforhthehreac onhwillhbehlargehandhposi ve.h-hA
h h h h h
1.hIfhthehdeltahG'°hofhthehreac onhAh-->hBhish-40hkJ/mol,hunderhstandardhcondi onshthehreac on:h
A)hishathequilibrium.h
B)hwillhneverhreachhequilibrium.h
C)hwillhnothoccurhspontaneously.h
D)hwillhproceedhathahrapidhrate.h
E)hwillhproceedhspontaneouslyhfromhAhtohB.h-hE
Forhthehreac onhAh--->B,hdeltahG'°h=h-
60hkJ/mol.hThehreac onhishstartedhwithh10hmmolhofhA;hnohBhishini allyhpresent.hA erh24hhours,hanalysishrev
ealshthehpresencehofh2hmmolhofhB,h8hmmolhofhA.hWhichhishthehmosthlikelyhexplana on?h
A)hAhandhBhhavehreachedhequilibriumhconcentra ons.h
B)hAnhenzymehhashshi edhthehequilibriumhtowardhA.h
C)hBhforma onhishkine callyhslow;hequilibriumhhashnothbeenhreachedhbyh24hhours.h
D)hForma onhofhBhishthermodynamicallyhunfavorable.h
E)hThehresulthdescribedhishimpossible,hgivenhthehfacththatG'°hish-60hkJ/mol.h-hC
Thehreac onhAh+hBh--->ChhashahdeltahG'°hofh-
20hkJ/molhath25°hC.hStar nghunderhstandardhcondi ons,honehcanhpredicththat:
A)hathequilibrium,hthehconcentra onhofhBhwillhexceedhthehconcentra onhofhA.h
B)hathequilibrium,hthehconcentra onhofhChwillhbehlesshthanhthehconcentra onhofhA.h
C)hathequilibrium,hthehconcentra onhofhChwillhbehmuchhgreaterhthanhthehconcentra onhofhAhorhB.h
D)hChwillhrapidlyhbreakhdownhtohAh+hB.h
E)hwhenhAhandhBharehmixed,hthehreac onhwillhproceedhrapidlyhtowardhforma onhofhC.h-hC
, Whichhofhthehfollowinghcompoundshhashthehlargesthnega vehvaluehforhthehstandardhfree-
energyhchangeh(G'°)huponhhydrolysis?h
A)hAce chanhydrideh
B)hGlucoseh6-phosphateh
C)hGlutamineh
D)hGlycerolh3-phosphateh
E)hLactoseh-hA
Forhthehfollowinghreac on,hdeltahG'°h=h+29.7hkJ/mol.
L-Malateh+hNAD+h--->oxaloacetateh+hNADHh+hH+
Thehreac onhashwri en:h
A)hcanhneverhoccurhinhahcell.h
B)hcanhoccurhinhahcellhonlyhifhithishcoupledhtohanotherhreac onhforhwhichhdeltahG'°hishposi ve.h
C)hcanhoccurhonlyhinhahcellhinhwhichhNADHhishconvertedhtohNAD+hbyhelectronhtransport.h
D)hcannothoccurhbecausehofhitshlargehac va onhenergy.
E)hmayhoccurhinhcellshathsomehconcentra onshofhsubstratehandhproduct.h-hE
Forhthehreac onhAh---
>B,hthehKeq'hish104.hIfhahreac onhmixturehoriginallyhcontainsh1hmmolhofhAhandhnohB,hwhichhonehofhthehfollo
winghmusthbehtrue?h
A)hAthequilibrium,htherehwillhbehfarhmorehBhthanhA.h
B)hThehratehofhthehreac onhishveryhslow.h
C)hThehreac onhrequireshcouplinghtohanhexergonichreac onhinhorderhtohproceed.
D)hThehreac onhwillhproceedhtowardhBhathahveryhhighhrate.h
E)hDeltahG'°hforhthehreac onhwillhbehlargehandhposi ve.h-hA
