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时间:2017-12-28
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1、1.(核酸性质—减色性,双链DNA,单链DNA,寡核苷酸)Whichhasthehighestabsorptionperunitmassatawavelengthof260nm?(B)ARNA.Bmononucleotides.Cdouble-strandedDNA.Dprotein.减色性跟紫外最大吸收峰Nucleotides(260)〉RNA〉ssDNA>double-strandedDNA4.(RNA的转录时,DNA的模板链和编码链(有义链和反义链))mRNA互补()的链是模板链(或称反义链,与反义链互补的是有义链)。Thesequence5’-AGTCTGACT-3’inD
2、NAisequivalenttowhichsequenceinRNA?(C)——给你DNA序列,找到对应的RNA序列,给你RNA序列,找到对应的DNA序列。A5’-AGUCUGACU-3’B5’-UGTCTGUCT-3’C5’-UCAGUCUGA-3’D5’-AGUCAGACU-3’DNA双链维持的结构是什么?AH-bondsanddisulfidebonds(二硫键)Bbasestackinginteraction(碱基堆积力)andpeptidebondsChydrophobicinteraction(疏水相互作用)andH-bondsDbasestackinginteract
3、ionandhydrophobicinteraction碱基堆积和疏水相互作用10.Whichoneoffollowingstatementsabouttelomere(端粒)andteromerase(端粒酶)isfalse?(B)ATelomerecontainsuptohundredscopiesofashortrepeatedsequence.BTeromeraseisatypicalDNApolymerase.(端粒酶不是经典的DNA聚合酶)CTheactivitiesoftelomerasearerelatedtothedevelopmentstagesandtissu
4、etypes.DThetelomereissynthesizedbytheenzymetelomeraseandDNApolymerase.11.Whichoneofthefollowingstatementsabouttelomere(端粒)andtelomerase(端粒酶)istrue?(C)(概念)ATheactivityoftelomeraseisverylowincancerandgermcell.BTelomereislongstretchesattheendsofthechromosomeandrichinG-C.CTelomeraseisthereversetra
5、nscriptaseresponsiblefortheextensionoftelomericrepeatDTelomeraseiscomplexofDNA,proteinandRNA.8种必须氨基酸14.Whichisthemajorforcesbetweentheaminoacidsinthepolypeptides(多肽链)?()AH-bondsanddisulfidebonds(二硫键)Bbasestackinginteraction(碱基堆积力)Chydrophobicinteraction(疏水相互作用)Dpeptidebonds(肽键)核酸是3,5磷酸二酯键21.Wh
6、ichoneofthefollowingstatementsaboutDNAsecondarystructureisnottrue?(D)AThebasicfeaturesofDNAdoublehelixwerededucedbyJamesD.WatsonandFrancisCrickin1953l.BThestructureidentifiedbyJamesD.WatsonandFrancisCrickisknownasB-formDNAwhichisright-handedform(右手螺旋).CUnderconditionsoflowhumidity,DNAcanbeindu
7、cedtoformA-formDNA.DZ-formDNAisright-handedliketheB-formDNA.(是左手)Forexample:telomerereplication端粒复制41.bpbasepairs碱基对2.GMOGeneticallymodifiedorganism基因修饰生物3.TheapproximatepurityofdsDNApreparationsmaybeestimatedbydeterminationoftheratioof
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