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分子生物学(MolecularBiology)知到章节测试答案智慧树2023年最新山东第一医科大学第一章测试
TheNucleicacidwillgetmaximumUVabsorbanceatwavelength_____()
参考答案:
260nm
ThecommoncomponentcomposedofDNAandRNAis_____()
参考答案:
Guanine
ThesecondarystructureofDNAis_____()
参考答案:
doublehelix
ThecorrespondinganticodontocodonACGis___()
参考答案:
CGU
SinglestrandDNA5’-CGGTA-3’canannealwiththefollowRNA_____()
参考答案:
5’-UACCG-3’
mRNAisusedas_____intranslation.()
参考答案:
template
AmountofTinRNAis0.25mol,soamountofAis_____.()
参考答案:
0.25mol
tRNAineukaryoticcellcontains_____()
参考答案:
5.8sRNA;5sRNA;18sRNA;28sRNA
ThebaseinDNA_____()
参考答案:
C;T;A;G
Stem-loopisatypeofsecondarystructurenotusuallyfoundintRNA.()
参考答案:
对
AllgenomesarecomposedofRNA.()
参考答案:
错
第二章测试
SequencesthatareremovedfromtheprimaryRNAtranscriptineukaryotesarecalled________.()
参考答案:
introns
Whichcharacterisnottrueforeukaryoticgenes?()
参考答案:
Alltheprotein-codinggenesinhighereukaryoteshaveintrons.
Whichisnotafeatureofenhancer?()
参考答案:
Ageneoftenhasonlyoneenhancer.
Theregulatorsofeukaryoticgeneexpressionconsistof________.()
参考答案:
enhancer;insulator;silencer
Allhousekeepinggeneshaveweakpromotorsandareregulatedtomaintaintheirgene
productsatconstantlowlevelconcentrations.()
参考答案:
错
第三章测试
BasedonMeselson-Stahlexperiment,eachdaughterDNAmoleculeiscomposedof()
参考答案:
oneoldandonenewstrand
Whichmechanismcanexplaintwostrandsaresynthesizedintheoppositedirection,inthereplicationfork?()
参考答案:
semidiscontinuousreplication
Althoughmammaliangenomeishuge,cellscanreplicatethegenomeinjustafewminutes.Whichisthemostpossiblereason?()
参考答案:
Hundredsofreplicationforksworksimultaneously
WhichisTUREabouttheinitiationofprokaryoticDNAreplication?()
参考答案:
DNAhelicaseunwindsDNAduplexatoriC
Whichis
FALSEabouttheterminationofprokaryoticDNAreplication?()
参考答案:
Coordinatethesynthesisoflaggingandleadingstrands
WhichisFALSEaboutDNApolIIIinprokaryotes?()
参考答案:
α,δ,ξsubunitsformcoreenzyme
MitochondrialDNAreplicatesin()
参考答案:
D-loopreplication
RNAprimerinDNAreplication()
参考答案:
isrequiredbyallOkazakifragments;provides3’-OHtosynthesizeDNA
DNAreplicationneeds()
参考答案:
helicase;primase;topoisomerase;DNAligase
WhatarethedifferencesofeukaryoticDNAreplicationfromprokaryotes?()
参考答案:
thereplicationoriginofeukaryotesisshorterthanthatinprokaryotes;telomereandtelomeraseaidterminationofeukaryotes;eukaryoticDNAisreplicatedinSphaseofcellcycle;eukaryoticDNAcontainsmultipleorigins
TheOkazakifragmentofeukaryotesislongerthanthatofprokaryotes.()
参考答案:
错
ReversetranscriptaseexertsthefunctionsofRNAdependentDNApolymeraseandDNAdependentDNApolymerase.()
参考答案:
对
第四章测试
WhichofthefollowingDNAdamagesbelongstoexogenousDNAdamage().
参考答案:
Ionizingradiation
WhichtypeofDNApointmutationswillnotleadtothechangeinaminoacid().
参考答案:
Silentmutation
whichbasesubstitutionbelowbelongsto“Transition”pointmutation.()
参考答案:
C→T
WhichiswrongbelowasdescribedfordirectlyundoingDNAdamagesrepair.()
参考答案:
null
InwhichprocessGG-NERandTC-NERshowdifferent()
参考答案:
DNAlesionrecognition
ThedeficiencyofNERrepairproteinsissusceptibleto_disease.()
参考答案:
Xerodermapigmentosum
Duringmismatchrepairinprokaryotes,thenewlysynthesizedDNAisrecognizedbythelackof()modification()
参考答案:
Methylation
DuringdoublestrandedDNAbreakrepair,NHEJshowsmoreprecisecomparedtoHR.()
参考答案:
错
DNAdamageisthemaincausefortheincreasedfrequencyofgenemutation.()
参考答案:
对
BaseexcisionrepairisoneofDNArepairpathwaystocorrectslargebaselesions.()
参考答案:
错
第五章测试
WhichcomponentoftheprokaryoteRNApolymeraseholoenzymeisinvolvedinrecognizingpromotersspecifictocertaintypesofgenes?()
参考答案:
σ
WhichRNApolymerasetranscribesthegeneofinsulin?()
参考答案:
RNApolymeraseII
AlltheRNAsbelowaretranscribedbyRNApolIexcept()
参考答案:
23SrRNA
Whichofthefollowingstepsoccursfirstinprokayotictranscription?()
参考答案:
formationofaclosedpromotercomplex
TheRhoproteinisinvolvedinthe_____stageoftranscription.()
参考答案:
termination
Inprokaryotes,RNApolymerasecanbindupstreamsequencesofpromotersdirectly.Eukaryotesneedsomeproteinstofacilitatethebinding.Whatarethenamesoftheseproteins?()
参考答案:
Transcriptionfactors
WhichtranscriptionfactorcanrecognizeandbindtoTATAbox?()
参考答案:
TFIID
AmutationtothissequenceineukaryoticmRNAwillaffecttheprocessbywhichthe3'-endpoly-AtailisaddedtothemRNA.()
参考答案:
AAUAAA
Thefunctionsof5’CapofeukaryoticmRNAinclude()
参考答案:
transportofthemRNAfromnucleustocytosol;;enhancementofthemRNA’stranslatability;;protectionofthemRNAfromdegradation;
Cis-actingelementsandtrans-actingfactorscontroltranscription.Thecis-actingelementsincludetheTATAbox,enhancersandotherelementsetal.()
参考答案:
对
RNAPolIIistheenzymesynthesizinghnRNAineukaryotes.Itisnotsusceptibletoamanitin.()
参考答案:
错
Eukaryotictranscriptionsisaccompaniedbytranslation.()
参考答案:
错
第六章测试
Weusuallycallcodonscontains5characteristics,amongwhichthedegeneracyofthegeneticcodemeans?()
参考答案:
Mostaminoacidshavemorethanonesetofcodons
AgenehasthebasesequenceACCCGTGCACGT.IftheAatthebeginningofthesequenceisdeleted,whatwillbehappen?()
参考答案:
AllofthecodonsafterApointwillbechanged
WhichbondisanaminoacidlinkedtothetRNA?()
参考答案:
ester
Theenergyrequiredforthestepofpeptidechainelongationinprokaryoticis?()
参考答案:
onlyGTP
TheShine-Dalgarnosequenceisfoundonthe________.()
参考答案:
mRNA
Amongthefollowingfactors,whichonecoulddelivertheaminoacyl-tRNAtotheAsiteofribosome?()
参考答案:
EF-Tu
ThespecificsequenceontheNterminusofsecretoryproteiniscalled()
参考答案:
signalpeptide
Whichproteinfactorhasthetranslocaseenzymeactivityineukaryotes:()
参考答案:
eEF-2proteinfactor
WhichoftheclassesofRNAmoleculesis/arepartoftheprocessof
translation?()
参考答案:
TransferRNA;MessengerRNA;RibosomalRNA
MessengerRNA(mRNA)ismadebyaprocesscalledtranslation.()
参考答案:
错
Polypeptidesunfoldinthecytoplasmofacelltoformafunctionalprotein.()
参考答案:
错
Thegeneticcodehasfourletters,A,T,G,andC.()
参考答案:
错
第七章测试
WhichisNOTafinalproductofgeneexpression?()
参考答案:
mRNA
Ifageneisexpressedatrelativelyconstantrateinalmostallthecells,itiscalleda(an)()
参考答案:
housekeepinggene
Themostefficientstepofgeneexpressionregulationis()
参考答案:
transcriptioninitiation
WhichoneisNOTacis-actingelement?()
参考答案:
activatorprotein
Theprokaryoticoperatorsequenceisusually().
参考答案:
locatedontheupstreamregionofpromoter
Intheregulationoflacoperon,whenthemediumcontainsbothglucoseandlactose,whichstatementistrue?()
参考答案:
bothrepressorandCAPareinactive
Inlacoperon,repressorproteincouldbindto()sequence.()
参考答案:
operator
Intheregulationoflacoperon,whenthemediumcontainsonlyglucose,whichstatementistrue?()
参考答案:
concentrationofcAMPislow,CAPisinactive
Ifageneisexpressedonlyincertainorgansortissues,thisiscalled()
参考答案:
spatialspecificityofgeneexpression
WhichisNOTthebasalcis-actingelementsineukaryotes?()
参考答案:
operator
Enhancersmustlocateontheupstreamregionofpromoter.()
参考答案:
错
Theactivechromatinusuallyshowslowlevelofmethylation.()
参考答案:
对
第八章测试
Whichstatementistrueaboutoncogenes?()
参考答案:
Theyareusuallyactivatedincancerdevelopment
Whichoneofthefollowingisoncogene?()
参考答案:
myc
Thefollowingchangespromoteoncogeneactivation,except()
参考答案:
Lossofheterozygosity
Themechanismsoftumorsuppressorgeneinactivationinclude()
参考答案:
Mutation;hypermethylation;Lossofheterozygosity
Inmostchronicmyelogenousleukemia,tumorigenesisiscausedbyoncogeneamplification()
参考答案:
错
第九章测试
ThebasicstepsofPCRreactionare:()
参考答案:
denaturation,annealing,extension
ThebasiccomponentsofthePCRsystemdoesnotinclude:()
参考答案:
NTP
WhichtechnologycanbeusedtoidentifyDNA?()
参考答案:
Southernblotting
Whicharerightaboutmolecularhybridization?()
参考答案:
FromtheunderstandingofDNAdenaturationandrenaturationphenomenon;Thehybridmoleculesmustbesingle
InthePCRreaction,thepurposeofannealingistomakethecombinationofprimerandtemplate.()
参考答案:
对
Proteinchiptechnologyhasthecharacteristicsoffastandhighthroughput,itcanbeusedtoanalyzethousandsofproteinsinthewholegenomelevelatthesametime.()
参考答案:
对
第十章测试
WhichofthefollowingstatementsisnottrueconcerningTypeIIrestrictionendonucleases?()
参考答案:
TheycancleavesingleDNA
Whichisnotnecessaryaspartofprokaryoticexpressionvector?()
参考答案:
PolyAsignal
Basedonthenamingrules,thefirstletterofarestrictionendonucleasemeans()
参考答案:
Bacterialgenus
Isocaudarnerpresents()
参考答案:
Variousrestrictionendonucleasesrecognizedifferentpalindromes,butproducesamestickyends
Plasmidsareusuallyintroducedintobacterialcellsby.()
参考答案:
Transformation
T4DNAligaserequires()
参考答案:
ATP
Ininsertionalinactivationscreening,thebacteriathataresensitivetotetracyclineandresistant
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