分子生物学考题及答案2VIP免费

装订线班级：学号：姓名：试题2及答案考试科目：《分子生物学》考试时间：120分钟试卷总分100分题号一二三四五六七总分得分评卷教师一、Explainthefollowingtermsandconcepts请解释下列术语或概念：（本大题共10小题，每题2.0分，总计20分）1.Frameshiftmutation2.Transposon3.Cis-element4.DNAcomplexity5.RNAi6.Negativeregulation7.epigenetics8.DNAreplication9.Transcripome10.Imprintgene二、choosethecorrectanswer（本大题共20小题，每题1分，共计20分，请将正确的答案写在答题纸上，其中1~15题全体考生作答，16~20题英语考生作答，21~25题日语及俄语考生作答）1．TheDNAandhistoneproteinsinaeukaryoticchromosomearecompactedintostructurescalled：(A)proteosomes；(B)nucleosomes；(C)telomeres；(D)centromeres2．Viralgenomesmaybecomposedof（A）RNAonly；（B）DNAonly；（C）eitherRNAorDNA；（D）bothRNAandDNA.3．Dicer蛋白是：（A）一种转录因子；（B）DNA复制的调控因子；（C）一种核酸酶；（D）RNA干涉过程中切割dsDNA的酶4．Geneslocatedinwhichregionofaeukaryoticchromosomearemostlikelytobetranscribed?（A）centromere；（B）telomere；（C）euchromatin；（D）heterochromatin5．Theeffectormoleculeforthetrpoperonis（A）allolactose；（B）cyclicAMP；（C）tryptophan；（D）aporepressor6．Thecataboliteactivatorprotein(CAP)bindstothe___toregulateexpressionofthelacoperon.（A）promoter；（B）cyclicAMP；（C）repressor；（D）inducer7．The3’5’exonucleaseactivityassociatedwithDNApolymerasereducesthefrequencyofreplicationerrorsto(A)1/10；(B)1/1,000；(C)1/1,000,000；(D)1/1,000,000,008．WhenculturesofE.coliaregrowninthepresenceoflactoseandglucose,thelacoperonisunder___control.(A)positive；(B)negative；(C)bothpositiveandnegative；(D)neitherpositiveornegative9．Griffithinjectedmicewithdifferenttypesofbacteria.Foreachofthefollowingbacteriatypes得分得分injected,indicatewhetherthemicelivedordied:a.typeⅡR；b.typeⅢS；c.heat-killedⅢS；d.typeⅡR+heat-killedⅢS（A）livedliveddieddied；（B）diedliveddiedlived（C）liveddiedliveddied；（D）dieddiedlivedlived10．TFIISfunctionsto:（A）BindSp1；（B）PhosphorylateTFIIH；（C）UnwindDNA；（D）StimulateRNAproofreading；（E）Terminatestranscription11．WhichchemicalagentinducesmutationsbyalkylatingcertainbasesinDNA?(A)5-bromouracil；(B)nitrousoxide；(C)hydroxylamine；(D)methylmethanesulfonate12．InE.coli,suppressormutationsareoftenlocatedingenesfor(A)metabolicenzymes；(B)promoters；(C)tRNAgenes；(D)DNApolymerase.13．TobeginDNAreplication,ashort___primermustfirstbeproduced.(A)DNA；(B)RNA；(C)polypeptide；(D)histone14．ThroughtheirexperimentswithDNAfromthebacteriumEscherichiacoli,MeselsonandStahlshowedthatDNAreplicationis(A)conservative.；(B)dispersive；(C)duplicative.；(D)semi-conservative15．AmutationchangesaCGbasepairtoanATbasepair.Thisisa___mutation.（A）transversion；（B）transition；（C）transpositional；（D）translocation16、Whichofthefollowingisanexampleofanonsensemutation?（A）ACGtoACC；（B）AUGtoUUG；（C）UACtoUAG；（D）AAAtoUUU17．AmutationoccursinwhichanAUUcodonischangedtoanAUCcodon.Bothofthesecodonssignifytheaminoacidleucine.Thisisa___mutation.(A)Nonsense；（B）missense；（C）silent；（D）neutral18．Inaeukaryoticcell,whenapositiveregulatoryproteininteractswithapromoterelement（A）transcriptionisactivated；（B）transcriptionisinhibited；（C）translationisinhibited；（D）replicationisactivated19．Ineukaryotes,aproteinissynthesizedinthe___andmodifiedinthe___.（A）nucleus;endoplasmicreticulum；（B）endopla...