大学生物英语测试题.doc

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1、Biol212Exam3Spring2014,Section71.WhichofthefollowingisUNTRUE?Inamulticellularorganismdifferentcellsbecomespecializedfordifferentfunctionsbecause…A.Differentcellsexpressdifferenttranscriptionalregulators.B.Transcriptionalregulatorsaremodifieddifferentlyin

2、differentcells.*C.Differentcellscontaindifferentgenes.D.Chromatinconformationvariesamongdifferentcells.E.DNAischemicallymodifieddifferentlyindifferentcells.F.Noneoftheabove.2.Whichisapotentialpointofgeneregulationineukaryotesbutnotprokaryotes?A.Transcrip

3、tion*B.RNAprocessingC.TranslationD.Post-translationE.Allareusedinbothprokaryotesandeukaryotes3.Whichofthefollowingisanexampleofpost-translationalregulation?A.IntronsplicingB.DNAmethylation*C.HistonemethylationD.RNApolymerizationE.Transcriptionalrepressio

4、n4.WhichofthefollowingisNOTDIRECTLYinvolvedintranscriptionalregulation?A.EnhancerelementsB.TranscriptionalrepressorproteinsC.DNAmethylationD.Chromatinstructure*E.Gproteincoupledreceptoractivation5.Glucocorticoid“targetgene”expressionisactivatedbyglucocor

5、ticoidhormonebecauseA.glucocorticoidsactivateareceptorkinasethatphosphorylatestranscriptionfactors.*B.glucocorticoidisasmalleffectormoleculethatbindsatranscriptionfactorandactivatesit.C.DNAbecomesglucosylated,triggeringgenetranscriptionD.glucorticoidsdeg

6、radetranscriptionalrepressorsE.Alloftheabove6.HowdoesDNAmethylationusuallyeffecttranscriptionofagene?A.EnhancestranscriptionB.Delaystranscription*C.ReducestranscriptionD.NoeffectontranscriptionE.ResultsinmethylatedmRNA7.Ifbindingofasmalleffectormoleculea

7、ctivatesatranscriptionalrepressor,thenincreasingconcentrationsoftheeffectorwouldresultinA.Increasedtranscriptionoftargetgenes*B.DecreasedtranscriptionoftargetgenesC.IncreasedtranscriptionoftherepressorD.DecreasedtranscriptionoftherepressorE.A&D8.Histonep

8、roteinsA.formnucleosomesB.containa“code”ofposttranslationalmodificationsthatregulategenetranscriptionC.areimportantindeterminingchromatinstructureD.interactwithDNAtoinfluenceaccessibilityoftranscriptionalregulatorstogenepr