Test Bank for Biochemistry, 2nd Edition by Roger L Miesfeld Complete Chapters 2021.pdf

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1. TheqdipoleqmomentqinqaqwaterqmoleculeqWhichqstatementqaboutqhydrogenqbondsqisqNOTqt
rue?
A) Hydrogenqbondsqaccountqforqtheqanomalouslyqhighqboilingqpointqofqwater.
B) Inqliquidqwater,qtheqaverageqwaterqmoleculeqformsqhydrogenqbondsqwithqthreeqtoqf
ourqotherqwaterqmolecules.
C) Individualqhydrogenqbondsqareqmuchqweakerqthanqcovalentqbonds.
D) Individualqhydrogenqbondsqinqliquidqwaterqexistqforqmanyqsecondsqandqsometimesqf
orqminutes.
E) Theqstrengthqofqaqhydrogenqbondqdependsqonqtheqlinearityqofqtheqthreeqatomsqi
nvolvedqinqtheqbond.


2. AqTRUEqstatementqaboutqhydrophobicqinteractionsqisqthatqthey:
A) areqtheqdrivingqforceqinqtheqformationqofqmicellesqofqamphipathicqcompoundsqinq
water.
B) doqnotqcontributeqtoqtheqstructureqofqwater-solubleqproteins.
C) haveqbondingqenergiesqofqapproximatelyq20–40qKjouleqperqmole.
D) involveqtheqabilityqofqwaterqtoqdenatureqproteins.
E) primarilyqinvolveqtheqeffectqofqpolarqsolutesqonqtheqentropyqofqaqueousqsystems.



3. Hydrophobicqinteractionsqmakeqimportantqenergeticqcontributionsqto:
A) bindingqofqaqhormoneqtoqitsqreceptorqprotein.
B) enzyme-substrateq interactions.
C) membraneqstructure.
D) three-dimensionalqfoldingqofqaqpolypeptideqchain.
E) Allqofqtheqanswersqareqcorrect.



4. Dissolvedqsolutesqalterqsomeqphysicalq(colligative)qpropertiesqofqtheqsolventqwaterq
becauseqtheyqchangeqthe:
A) concentrationqofqtheqwater.
B) hydrogenqbondingqofqtheqwater.
C) ionicqbondingqofqtheqwater.
D) pHqofqtheqwater.



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E) temperatureqofqtheqwater.



5. Osmosisqisqmovementqofqa:
A) chargedqsoluteqmoleculeq(ion)qacrossqaqmembrane.
B) gasqmoleculeqacrossqaqmembrane.
C) nonpolarqsoluteqmoleculeqacrossqaqmembrane.
D) polarqsoluteqmoleculeqacrossqaqmembrane.
E) waterqmoleculeqacrossqaqmembrane.



6. Aqhydroniumqion:
A) hasqtheqstructureqH3O+.
B) isqaqhydratedqhydrogenqion.
C) isqaqhydratedqproton.
D) isqthequsualqformqofqoneqofqtheqdissociationqproductsqofqwaterqinqsolution.
E) Allqofqtheqanswersqareqcorrect.



7. TheqpHqofqaqsolutionqofq1qMqHClqis:
A) 0.
B) 0.1.
C) 1.
D) 10.
E) –1.



8. TheqpHqofqaqsolutionqofq0.1qMqNaOHqis:
A) 0.1.
B) 1.0.
C) 12.8.
D) 13.
E) 14.




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9. WhichqstatementqisqTRUEqaboutqtheqpropertiesqofqaqueousqsolutions?
A) AqpHqchangeqfromq5.0qtoq6.0qreflectsqanqincreaseqinqtheqhydroxideqionqconcentrationq(
[OH–])qofq20%.
B) AqpHqchangeqfromq8.0qtoq6.0qreflectsqaqdecreaseqinqtheqprotonqconcentrationq([H+])qb
yqaqfactorqofq100.
C) Chargedqmoleculesqareqgenerallyqinsolubleqinqwater.
D) Hydrogenqbondsqformqreadilyqinqaqueousqsolutions.
E) TheqpHqcanqbeqcalculatedqbyqaddingq7qtoqtheqvalueqofqtheqpOH.



10. TheqpHqofqaqsampleqofqbloodqisq7.4,qwhileqgastricqjuiceqisqpHq1.4.q Theqbloodqsampleqhas:
A) 0.189qtimesqtheq[H+]qasqtheqgastricqjuice.
B) 5.29qtimesqlowerq[H+]qthanqtheqgastricqjuice.
C) 6qtimesqlowerq[H+]qthanqtheqgastricqjuice.
D) 6000qtimesqlowerq[H+]qthanqtheqgastricqjuice.
E) oneqmillionqtimesqlowerq[H+]qthanqtheqgastricqjuice.



11. TheqaqueousqsolutionqwithqtheqLOWESTqpHqis:
A) 0.01qMqHCl.
B) 0.1qMqaceticqacidq(pKaq=q4.86).
C) 0.1qMqformicqacidq(pKaq=q3.75).
D) 0.1qMqHCl.
E) 10–12qMqNaOH.



12. TheqaqueousqsolutionqwithqtheqHIGHESTqpHqis:
A) 1qMqHCl.
B) 1qMqNH3q(pKaq=q9.25).
C) 0.5qMqNaHCO3q(pKaq=q3.77).
D) 0.1qMqNaOH.
E) 0.001qMqNaOH.




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13. Phosphoricqacidqisqtribasic,qwithqpKa'sqofq2.14,q6.86,qandq12.4.qTheqionicqformqthatqp
redominatesqatqpHq3.2qis:
A) H3PO4.
B) H2PO–4.
C) HPOq42–.
D) POq43–.
E) Noneqofqtheqanswersqisqcorrect.



14. WhichqstatementqaboutqbuffersqisqTRUE?
A) AqbufferqcomposedqofqaqweakqacidqofqpKaq=q5qisqstrongerqatqpHq4qthanqatqpHq6.
B) AtqpHqvaluesqlowerqthanqtheqpKa,qtheqsaltqconcentrationqisqhigherqthanqthatqofqtheqa
cid.
C) TheqpHqofqaqbufferedqsolutionqremainsqconstantqnoqmatterqhowqmuchqacidqorqbaseqisqa
ddedqtoqtheqsolution.
D) Theqstrongestqbuffersqareqthoseqcomposedqofqstrongqacidsqandqstrongqbases.
E) WhenqpHq=qpKa,qtheqweakqacidqandqsaltqconcentrationsqinqaqbufferqareqequal.



15. AqcompoundqhasqaqpKaqofq7.4.q Toq100qmLqofqaq1.0qMqsolutionqofqthisqcompoundqatqpH
8.0qisqaddedq30qmLqofq1.0qMqhydrochloricqacid.qTheqresultingqsolutionqisqpH:
A) 6.5.
B) 6.8.
C) 7.2.
D) 7.4.
E) 7.5.



16. TheqHenderson-Hasselbalchqequation:
A) allowsqtheqgraphicqdeterminationqofqtheqmolecularqweightqofqaqweakqacidqfromqitsqp
Hqalone.
B) doesqnotqexplainqtheqbehaviorqofqdi-qorqtri-basicqweakqacids.
C) employsqtheqsameqvalueqforqpKaqforqallqweakqacids.
D) isqequallyqusefulqwithqsolutionsqofqaceticqacidqandqofqhydrochloricqacid.
E) relatesqtheqpHqofqaqsolutionqtoqtheqpKaqandqtheqconcentrationsqofqacidqandqconjugateqb
ase.




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