生物dna复制经典选择例题（Examples of classic selection of biological DNA replication）Word下载.docx

生物dna复制经典选择例题（Examples of classic selection of biological DNA replication）Word下载.docx

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D.DNAligase

E.DNApolymeraseII

4.whatistheeffectofthyminetwo,whichoccursinDNA,asamutation?

A.doesnotterminatereplication

B.isrepairedbyagroupofenzymesincludingligase

C.readbyshiftmutation

D.iscatalyzedbythyminetwoenzyme

CovalentbondsbetweenthyminestrandsonE.twostrandsofcomplementarynucleotides

Whichofthefollowingenzymesisnotneededfor5.DNAreplication?

A.DNAdirectedDNApolymerase.

B.DNAdirectedRNApolymerase

C.ligase

D.RNAdirectedDNApolymerase

E.helixenzyme（helieAse）,topologicalisomerase（topoisomerAse）andhelicase（gyrAse）.Hui@JiaoZi$/xueHuiEdu.Com

6.whichofthefollowingstatementsaboutthereproductionofDNAiswrong?

A.hasDNAdirectedRNApolymerasetoparticipate

B.hasRNAdirectedDNApolymerasetoparticipate

C.isasemireservedcopy

D.ismadefromfourkindsofdNTP

E.hasDNAdirectedDNApolymerasetoparticipate

When7.DNAreplicates,thesequence5'

-TpApGpAp-3'

willsynthesizethefollowingcomplementarystructures

A.5'

-TpCpTpAp-3，

B.5'

-ApTpCpTp-3，

C.5J-UpCpUpAp-3，

D.5'

-GpCpGpAp-3，

E.3'

8.syntheticDNArawmaterialis

A.dAMPdGMPdCMPdTMP

B.dATPdGTPdCTPdTTP

C.dADPdGDPdCDPdTGP

D.ATPGTPCTPUTP

E.AMPGMPCMPUMP

9.whichofthefollowingistrueaboutthedescriptionofEscherichiacoliDNApolymeraseI?

A.hasa3'

-5'

exonucleaseactivity

B.hasanenzymeactivityof5'

endonuclease

C.

Proteinmodification

20.inDNAreplication,theroleofRNAprimersis

A.activatesDNApolymeraseIII

B.causesDNAdoublestrandstounravel

C.provides5〃end〃asasynthesis,newDNAchain,startingpoint,wisdom/Discussion&

altar&

XuEHui.Com

D.provides3〃0H〃asthestartingpointforthesynthesisofnewDNAchains

E.provides3〃0H〃asthestartingpointforthesynthesisofnewRNAchains.

Initiationof21.DNAreplication,participationfromthesupercoileddoublestrandedchainenzymeorunlockfactor

A.unwindingenzyme

B.topoisomeraseI

C.DNAbindingprotein.

D.initiatedprecursor

E.topoisomeraseii.

22.,thenatureoftelomeraseisone

A.DNApolymerase

B.RNApolymerase

C.DNAhydrolase

D.reversetranscriptase

E.ligase

23.abouttheroleofDNApolymeraseinDNAreplication,theerroris

TheA.substrateisdNTP

B.musthaveaDNAtemplate

ThesynthesisdirectionofC.canonlybe5'

D.requiresATPandMgtoparticipate

E.causesDNAdoublestrandstounravel

24.,aboutEscherichiacoliDNApolymeraseIII,theerroristhat

A.catalyzestheattachmentofdNTPtothe5hydroxyendoftheDNAfragment

B.catalyzeddNTPwasattachedtoprimerchainsandcollectedbymedicaleducationnetwork

C.requiresfourdifferentdNTPasafunction

D.isanasymmetrictwodimercomposedofavarietyofsubunits

E.playsamajorroleinDNAreplicationinthelengtheningofthestrand

25.thefollowingdescriptionofEscherichiacoliDNApolymeraseisincorrect

A.DNApolIcanbedividedintotwofragmentsofsize

B.DNApolIIhas3'

5'

C.DNApolIIIplaysamajorroleinreplicationchainelongation

D.DNApolIIIconsistsoffoursubunits

E.actsastheagentwithfournucleosides

26.DNAreplicationinitiationprocessstatement,erroris

TheinitiationofA.involvesinitiationofenzymesandinitiationofprecursors

B.triggeredenzymesareaspecialkindofRNApolymerase

TheinitiationoftheC.followerchainissimplerthantheinitiationoftheleadingstrand

D.triggerprecursorcontainsmanyproteinfactors

TheprecursorandinitiatorcanbeassembledintoinitiatoranddissociatedbyE.

27.,thereasonforthelowreplicationerrorrateofDNAinprokaryotesisthattheexplanationiswrong

A.DNApolIhasa3'

-5'

B.DNApolIhasa5'

exonucleaseactivity,

BothC.DNApolIandIIIhaveendonucleaseactivity

D.DNApolIIIhas3'

E.DNApolIandIIIare3'

28.aboutthedescriptionofligaseinDNAreplication,theerroris

A.catalyzestheattachmentofadjacentDNAfragmentsto5'

3，-phosphoricacidtwoesterbonds

B.connectionreactionsrequireATPorNADinvolvement

C.catalyzestheattachmentofadjacentDNAfragmentsto3'

5'

-phosphoricacidtwoesterbonds

D.participatesinthegenerationofthefollowerchain

E.

Inthecatalyticreaction,anintermediateisformedwithATP

29.okazakifragmentsrefersto

DNAfragmentontheA.DNAtemplate

DNAsegmentssynthesizedonB.strand

DNAfragmentssynthesizedonC.leadingstrand

SynthesisofRNAfragmentscatalyzedbyD.primers

E.synthesizedbyDNAligaseDNA.

30.thefollowingprocessrequiresDNAligaseis

A.DNAreplication

B.RNAtranscription

C.DNAfractureandmodification

MethylationofD.DNA

AcetylchemistryofE.DNA

When31.DNAreplicates,donotrequireanyofthefollowingenzymesinvolved?

A.DNAdirectedDNApolymerase

B.DNAligase

C.topoisomerase

D.unwindingenzyme

E.restrictionendonuclease

When32.DNAreplicates,themodeofsynthesisofprogenyDNAis

A.twochainsarediscontinuoussynthesis

B.twochainsarecontinuoussynthesis

C.twostrandsareasymmetrictranscriptionsynthesis

ThetwochainsofD.are3,5,andtwo

E.achain,5 3anotherchain3,‘5Jsynthesis

33.enzymesthatidentifythestartingpointofDNAreplicationaretheenzymesthat

C.primers

D.topoisomerase

E.unwindingenzyme

34.,aboutthesemidiscontinuoussynthesisofDNA,theerroneousstatementisthat...

TheA.leadingchainiscontinuouslysynthesized

TheB.chainoffollowersisdiscontinuouslysynthesized

TheC.fragmentisthediscontinuoussynthesisofOkazakifragments

HalfofthesynthesisoftheD.leadingchainandthefollowerchainisdiscontinuous

ThesynthesisoftheE.chainfollowsthesynthesisoftheleadingstrand

35.leadchainsarecontinuouslysynthesized,andstrandchainsarediscontinuouslysynthesized.LifescientistsareaccustomedtocallingthisDNAreplicationas

A.alldiscontinuousreplication

B.fullcontinuousreplication

C.allreservedreplication

D.semidiscontinuousreplication

E.noneoftheabove._Huieducationnetwork$@

36.comparingtheDNAreplicationofeukaryoteswithprokaryotes,thesimilaritiesbetweenthetwoarethat

ThelengthofA.primersisshorter

ThesynthesisdirectionofB.is5，-3'

C.Okazakifragmentlengthshort

D.hasmultiplereplicationstartpoints

E.DNAreplicationisslower（50nt/s）

37.enzymesinvolvedinprokaryoticDNAreplicationare

A.DNAPolalpha

B.DNAPolI

C.DNAPolgamma.

D.DNAPolDelta

E.DNAPolIII

38.enzymesinvolvedinprokaryoticDNArepairare

A.DNAPolalpha

C.DNAPolgamma

39.therepairofthedamagecausedbyUVirradiationinEscherichiacoliis

A.recombinationrepair

B.UvrABC

C.SOSrepair

D.DNAmethylationmodification

E.telomerase

40.chromosomeDNAtelomereshorteningandreducethedegradationistheway

c.

SOSrepair

41.eukaryoticchromosomeshavereversetranscriptioneffects

A.reversetranscriptase

B.telomerase

C.terminaltransferase

D.retrovirus

E.phagevirus

42.inDNAreplication,thecatalyticremovalofprimerstosupplementthevoidenzymeis

A.methyltransferase

B.ligase

D.DNA.Poll

E.terminaltransferase

43.enzymesthatcatalyzetheformationoftwophosphatebondsadjacentto5'

phosphategroupand3'

hydroxylgroupinDNAare

D.DNAPolI

44.inDNAreplication,theenzymethatcatalyzesthesynthesisofprimersis

45..Brownskindiseaseisakindoftransmittedskindiseaseinhumanbeings.Themolecularbasisofthisdiseaseisthatitis

A.cellmembranepermeabilitydefectscauserapiddehydration

B.inactivatetemperaturesensitiveenzymesinsunlight

C.wasinducedbyultravioletradiationtoinducevirulentpreviruses

D.cellsdonotsynthesizecarotenoidlikecompounds

ThereisadefectintheexcisionrepairsystemofthyminetwoonE.DNA

46.diseasesrelatedtotheDNArepairprocessarecollectedbythemedicaleducationnetwork

A.’sdryskindisease

B.porphyria

C.jaundice

D.xanthineurinedisease

E.gout

47.whatisthefollowingdescriptionaboutthecharacteristicsofmammalianDNAreplication?

A.RNAprimersweresmaller

B.Okazakifragmentssmaller

C.DNApolymerase,alpha,beta,andgammaareinvolved

D.hasonlyonestartingpointforreplication

WhenE.fragmentsareconnected,energyissuppliedbytheA