生物dna复制经典选择例题（examples of classic selection of biological dna replication）

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1、生物dna复制经典选择例题（ExamplesofclassicselectionofbiologicalDNAreplication）RadioIn1.1958years,experimentsonMeselsonandStAhlusing15Nand14NlabeledEscherichiacoliDNAfirstdemonstratedwhichofthefollowingmechanisms?A.DNAcanbecopiedTheB.DNAgenecanbetranscribedintomRNAC

2、.DNAgenecanbeexpressedasproteinD.DNA'smechanismofsemiretainedreplicationE.DNAtotalretentionreplicationmechanism2.DNAreplicatesinasemi-reservedmanner.WhathappensifafullylabeledDNAmoleculereplicatestwogenerationsinanon-radioactivesolution,producingfourDNAm

3、olecules?A.twomoleculesareradioactive,twomoleculesarenotradioactiveB.isradioactiveC.twointhechainhalfradioactiveD.oneoftwostrandshavingradioactivityNoradioactivitywasfoundinE.3.ifoneofthefollowingenzymesisabsent,oneofthenucleotidesonthereplicationforkcan

4、notbeadded.Whatkindofenzymeisthis?A.DNAsynthaseI(polymerizationactivity)B.DNApolymerase(5'-3'exonucleaseactivity)C.DNApolymeraseIIID.DNAligaseE.DNApolymeraseII4.whatistheeffectofthyminetwo,whichoccursinDNA,asamutation?A.doesnotterminatereplicationB.isrep

5、airedbyagroupofenzymesincludingligaseC.readbyshiftmutationD.iscatalyzedbythyminetwoenzymeCovalentbondsbetweenthyminestrandsonE.twostrandsofcomplementarynucleotidesWhichofthefollowingenzymesisnotneededfor5.DNAreplication?A.DNAdirectedDNApolymerase.B.DNAdi

6、rectedRNApolymeraseC.ligaseD.RNAdirectedDNApolymeraseE.helixenzyme(helieAse),topologicalisomerase(topoisomerAse)andhelicase(gyrAse).Hui@JiaoZi$/xueHuiEdu.Com6.whichofthefollowingstatementsaboutthereproductionofDNAiswrong?A.hasDNAdirectedRNApolymerasetopa

7、rticipateB.hasRNAdirectedDNApolymerasetoparticipateC.isasemireservedcopyD.ismadefromfourkindsofdNTPE.hasDNAdirectedDNApolymerasetoparticipateWhen7.DNAreplicates,thesequence5'-TpApGpAp-3'willsynthesizethefollowingcomplementarystructuresA.5'-TpCpTpAp-3'B.5

8、'-ApTpCpTp-3'C.5'-UpCpUpAp-3'D.5'-GpCpGpAp-3'E.3'-TpCpTpAp-3'8.syntheticDNArawmaterialisA.dAMPdGMPdCMPdTMPB.dATPdGTPdCTPdTTPC.dADPdGDPdCDPdTGPD.ATPGTPCTPUTPE.AMPGMPCMPUMP9.whichofthefollowingistrueaboutthedescriptionofEsch