真题答案总结范文.doc_第1页
真题答案总结范文.doc_第2页
真题答案总结范文.doc_第3页
真题答案总结范文.doc_第4页
真题答案总结范文.doc_第5页
已阅读5页,还剩2页未读 继续免费阅读

下载本文档

版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领

文档简介

真题答案总结范文 97-994.Absorbance=LgI0/I,0.05percent=0.05%X1000=0.5mg12.Operon can contain morethan onepromoter forexample thepromoter forregulator genes21.Although celluloseis synthesizedon themembrane,but hemicelluloseand pectinare synthesizedin GA.34.Prokaryotic ribosome(Large subunitcontain about30proteins whilesmall20)Eukaryotes(Large45,small30)40.There areleast suessfulconjugation inHfr2,and thelargest regionin thisgroup isbetween His and Arg41.EGTA isrelated toEDTA,but witha muchhigher affinityfor Ca2+than Mg2+.There arestill someVSV-G proteinsbe transportedto cis-Golgi,so Cis incorrect,the mostlikely isA.42.E becauseEGTA can inhibit VSV-G proteintransportation.9411.partially dominance=inplete dominance.This casealso can be consideredas codominance:Alleles interaction:Inplete dominance(1:2:1when self-test),codominance,mosaic dominanceNonallelic interaction:Complementary(9:6:1),dominant epistasis(12:3:1),double recessive epistasis(9:7),recessiveepistasis(9:4:3),inhibitor gene(13:3)16.PH=-lg(10-7+10-8)=7-lg1.124.Cytochrome alwaysin mitochondriaor SER25.29.Chloroplast inheritanceis typicalmaternal inheritance(maze stripediojap trait)30.RF=(1/2T+ND)/total number,if PD=NPD,the genes are notlinked,if PDNPD,they arelinked.35.When thereaction isS-P this is the first-order reaction,v=S,is thefirst-order constant.When thereaction isS1+S2-P,thisisa second-order reaction,isasecond-order constant,v=S1S2,=KT/h e-G+/RT So the answer is first-order constant49.avidin isa highlyglycosylated proteinwith boundbiotin,is relativelyhigh non-specific binding,can beused forprotein purification.50.nitrate NO3-,nitrite NO2-,the elelctronegativepotential ofatoms FONS=CP=H,so herethe answer is phosphate.57.Transposable elementcan transportwithin areplicon orbetween replicons.66.Testosterone issteroid hormone,so ithas nuclearreceptor astranscription activator,once boundthe receptorcan bereleased fromsequestration suchas Hsp90,and dimerizeto bindto DNAand activatetranscription.Vassopressin andadrenocorticotropic hormoneare bothpeptide hormone.69.NADH is not trulycross mitochondriamembrane,but viaglycerol-3phosphate shuttleand malate-aspartate shuttle.70.G-oligosaharides areformed ondolichol inRER withthe positionof(GlcNAc)2(Man)9(Glc)3,and undergoescore glycosylationto proteins.Galactose isadded onlyin terminalglycosylation inGA.SotheanswerisGA73.The questionasks thebases incorporatedto products,not includingprimer.76.endonucleolytic cleavageof3end isalternative splicing.78.Fructose1,6-bisphosphate isinvolved in thefirststep ofglyceraldehyde3-phosphate anddihydroxylacetone condensation.80.AMP isnot witha phosphorylgroup thatcanbeeasily transferred.85.a primaryspermatocyte containtwo plementarychromosomes and4chromatids,so2n/4c.88.Release ofCa2+from SERin musclethrough ryanodinechannel dependson plasmamembrane potentialchange whichis conductedby transversetubule.96.POB P84498.They arethe aminogroup ofGlu andamido groupof Gln102.nucleoplasmin isa chaperonein nucleus103.Rhodopsin aeptlight energyand conformationalchange toactivate Gprotein transducinwhich inturn activatecGMP phosphdiesteraseto decreaselevel ofcGMP whichleads toclosure ofNa+channel.108.119.Because AZTis thymidineanalog,so it isnot likely thatit cannot enternucleus,and becausemismatch repairenzyme doesnot distinguishHIV cDNAand hostDNA,so it is alsonotlikelythat MMRplay arole.The mostlikely reasonis DNAPol doesnot aeptthis analogjust asit doesnot aepta mismatchnucleotide oroxyribonucleotide whilereverse transcriptaseaepts.120.only enhancercan promotetranscription bothdownstream andupstream.123.Theta replication=bidirectional replication,so theanswerisD125.phase ofmeiosis prophaseI:leptotene:introduce DSBand singlestrand invasionto initiaterebination.Zygotene:Formation ofsynapsis andsynaptonemal plex.Patchtene:rebination ours.Diplotene:Synaptonemal plexdissemble andhomologous chromosomeremain atchiasma.Diakinesis:Condensation ofchromosome.Synaptonemal plexconsists ofchromatin,lateral elementand centralelement,between centraland lateralelement aretraverse filament.126.Chiasma iscross-over,which marksrebination.132.it containsUAA soit isa stopcodon,so D143.Mercaptoethanol anddithiothreitol canreduce andbroke disulfidebond andacetoactate canform covalentbond withCys.So C146.D149.Horizen lihe numberof bacteriais equalto noUV irradiation,so theDNA damageis repairedby photoactivationin strain1.151.Just likefree radicalOH,itisa chainof free-radical reaction,152.The bestway toterminate thereaction isto eliminatefree-radical,so D.156.phosphatase inhibitorcan inhibitaggregation,besides cAMPcaninhibitaggregation indicatingcAMP-kinase inhibitaggregation.so proteindephosphorylation isimportant.158.D contain“all”,so incorrect,so Cis the most possibleone.163.They stillhave T cells,so caninduce theclonal selectionof memoryand otherTcellsto mountimmune responseto previouslymet ornot metantigens.170.in orderto studythe studythe relationbetween C4acids,3-PGA andHexose phosphatase,the timeshould bedecreased.176.the enzymehydrolyze X-P whenY isnot present,but slowerthan Yis present.Sub200013.Retrotransposon maycontain introns22.Protein synthesisis beforemRNA translationbecause mRNAof maternal-effect geneis translatedbefore anyzygotic-effect mRNAis transcribed.28.All threeare monpathway toregulate prokaryotesbehavior31.Stereoisomer=mirror imagewhen themolecule containsonly onechiral molecule.Only Bcontains onechiral moleculeand aremirror image.42.when thetwo mutationsdo notbelong twosame cistron,in heterozygousstatus,they canplement eachother.If not,they arevery likelyto bein the same cistron.B iscorrect ifthey areinthedifferent plementationgroup.61.TMamine+H2O=TMammonium+OH-Kb=OH-TMammonium+/TMamineTMammonium+in water:TMammonium=TMammine+H+So Ka=TMammineH+/TMammonium=TMammineH+OH-/KbTMammine=10-14/7.4X10-5PKa=14-4.13=9.87In otherwords,the PKaof acidand PKbof itscorresponding basehas therelationship:KaKb=10-14and PKa+PKb=1474.The parentaltype isdominant thanNP,so thegenesarelinked.76.Bacterial andeukaryotes hasthesametranslation intiationcodon AUG95.Cytosine hasmost doublebond inits ringand thusthemostplannar100.Endoderm gives rise to:Digestive systemand associatedligand,respiratory systemand liver.Mesoderm:Chordalmesoderm gives rise tonotochord.Paraxial endodermgivesrise to somiteand head,somite givesrises tocartilage,bone,vertebral columnand associatedconnective tissue,skeletal muscle,dermis.Intermediate mesoderm givesriseto gonadand kidney.Lateral platemesodermgivesrisetocirculatory systemincluding heart,blood vesseland bloodcells,body cavitylining,mesoderm(connective tissue)of limband extraembryonicmembrane forimport nutrientsfor embryo.Ectoderm:Hair,skin,sweat gland,mammary gland,sensory organand nervoussystem.108.5000,000dpm correspondsto1000micromole in2hours,so5000dpm correspondsto10micromole in2hours,so correspondsto5micromole perhour.118.Intron splicingours onmRNA soitisnot DNArearrangement.Intron splicingin ciliais selfsplicing.127.Nuclear envelopecancontainribosome soit canbe sitesof proteinsynthesis.139.Arginase isa ureacycle enzymecatalyzing theargine toorthonine andurea.The formationof arginosuinateis catalyzedby arginosuinatesynthetase andits convertionto suinateand argineis catalyzedby arginosuinase.158.disinteg

温馨提示

  • 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
  • 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
  • 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
  • 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
  • 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
  • 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
  • 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

评论

0/150

提交评论