免疫英语题目与答案分享

免疫英语题目与答案分享考试时间：______分钟总分：______分姓名：______Part1:MultipleChoiceQuestions1.ThecellsprimarilyresponsibleforrecognizingforeignantigenspresentedbyMHCclassImoleculesare:A.BlymphocytesB.HelperTlymphocytesC.CytotoxicTlymphocytesD.Macrophages2.WhichofthefollowingisNOTamajorcomponentofthecomplementsystem?A.C3andC4B.FactorBC.ImmunoglobulinGD.C1q3.TheprocessbywhichBlymphocytesbecomesensitivetoanantigeniscalled:A.ApoptosisB.ClonalselectionC.DifferentiationD.Anaphylaxis4.Antibodiesthatcanbindtomultipleepitopesonthesameantigenmoleculearecalled:A.MonoclonalantibodiesB.PolyclonalantibodiesC.IsoantibodiesD.Heterophileantibodies5.MHCclassIImoleculesareprimarilyfoundon:A.CytotoxicTlymphocytesB.BlymphocytesandmacrophagesC.NeutrophilsD.Endothelialcells6.Theinflammatorymediatorthatpromotesthedilationofbloodvesselsis:A.HistamineB.ProstaglandinC.LeukotrieneD.Interleukin-17.TheprocessbywhichmatureBcellsexitthebonemarrowiscalled:A.PositiveselectionB.NegativeselectionC.EmigrationD.Differentiation8.TcellsthathelpactivateBcellsarecalled:A.CytotoxicTlymphocytesB.MemoryTlymphocytesC.HelperTlymphocytesD.RegulatoryTlymphocytes9.ThemajorfunctionofcytotoxicTlymphocytesisto:A.ProduceantibodiesB.PresentantigensC.PhagocytosepathogensD.Killinfectedorabnormalcells10.TheprocessbywhichTlymphocytesrecognizeself-antigensanddonotattackself-tissuesiscalled:A.ClonalanergyB.CentraltoleranceC.PeripheraltoleranceD.Activation-inducedcelldeathPart2:MultipleChoiceQuestions(withmultiplecorrectanswers)11.Whichofthefollowingarefunctionsofantibodies?A.NeutralizationoftoxinsB.OpsonizationofpathogensC.ActivationofthecomplementsystemD.Regulationofimmuneresponses12.WhichofthefollowingcellscanpresentantigenstoTlymphocytes?A.MacrophagesB.BlymphocytesC.DendriticcellsD.Epithelialcells13.ThefollowingareexamplesofinnateimmunecellsEXCEPT:A.NeutrophilsB.LymphocytesC.MacrophagesD.Eosinophils14.WhichofthefollowingcytokinesisprimarilyinvolvedinthepromotionofTh1responses?A.Interleukin-4B.Interleukin-10C.Interferon-gammaD.Tumornecrosisfactor-alpha15.Whichofthefollowingaremechanismsofimmuneregulation?A.SuppressionbyregulatoryTcellsB.ApoptosisofactivatedlymphocytesC.Antibody-dependentcell-mediatedcytotoxicityD.Productionofanti-inflammatorycytokinesPart3:ShortAnswerQuestions16.Brieflydescribethedifferencebetweenactiveandpassiveimmunity.17.ExplaintheroleofMHCmoleculesintheimmuneresponse.18.Whatisthefunctionofthecomplementsystem?19.DescribetheprocessofclonalselectioninBcells.20.WhatarethemajortypesofThelpercellresponses,andwhataretheirfunctions?Part4:TranslationTranslatethefollowingparagraphintoChinese:Theadaptiveimmunesystemischaracterizedbyitsabilitytomountaspecificandmemoryresponsetopathogens.Thissysteminvolvestwomaintypesoflymphocytes:BcellsandTcells.Bcellsareresponsibleforproducingantibodies,whileTcellscanrecognizeanddirectlykillinfectedcellsorhelpBcellsproduceantibodies.ThedevelopmentofBandTcellsinvolvesaprocesscalledpositiveandnegativeselectioninthethymusandbonemarrow,respectively,whichensuresthatthesecellscanrecognizeforeignantigensbutdonotattackself-tissues.Part5:ShortAnswerQuestions(inEnglish)21.Explaintheconceptofimmunologicaltolerance.Whyisitimportant?22.DescribethegeneralstepsinvolvedintheactivationofaBcell.23.Whatisthesignificanceoftheclassswitchinantibodies?24.Discusstheroleofcytokinesinmodulatingimmuneresponses.25.Compareandcontrastthefunctionsofmacrophagesanddendriticcellsintheimmunesystem.试卷答案Part1:MultipleChoiceQuestions1.C2.C3.B4.B5.B6.A7.C8.C9.D10.B解析：1.CytotoxicTlymphocytes(CTLs)arespecializedinrecognizingantigenspresentedonMHCclassImolecules,whichareexpressedonalmostallnucleatedcells.2.Thecomplementsysteminvolvesacascadeofproteins(C1q,C2,C4,C3,FactorB,etc.)thatmediateinflammationandlysisofpathogens.ImmunoglobulinGisanantibody,notacomplementcomponentintheclassicaloralternativepathways.3.Clonalselectionistheprocessbywhichlymphocytesthatrecognizeaspecificantigenproliferateanddifferentiateintoeffectorcells.ThisisthemechanismbywhichBcellsbecomesensitivetoanantigentheyencounter.4.PolyclonalantibodiesareproducedbydifferentBcellclonesandcanrecognizemultipleepitopesonthesameantigenmolecule.5.MHCclassIImoleculesareprimarilyexpressedonprofessionalantigen-presentingcells(APCs),includingBlymphocytesandmacrophages,whichpresentexogenousantigenstoCD4+Thelpercells.6.Histamine,releasedprimarilybymastcellsduringinflammation,causesvasodilation,increasedvascularpermeability,andsmoothmusclecontraction.7.EmigrationreferstotheprocessbywhichmatureBcellsleavethebonemarrowandenterthecirculation.8.HelperTlymphocytes(CD4+Tcells)playacrucialroleincoordinatingtheimmuneresponsebysecretingcytokinesthatactivateBcells,cytotoxicTcells,andmacrophages.9.TheprimaryfunctionofcytotoxicTlymphocytesistorecognizeandkillcellsthatareinfectedwithvirusesorhavebecomecancerous.10.CentraltoleranceoccursduringthedevelopmentofTcellsinthethymusandbonemarrow,wherecellsthatstronglyrecognizeself-antigensareeliminatedoranergized.Part2:MultipleChoiceQuestions(withmultiplecorrectanswers)11.A,B,C,D12.A,B,C13.B14.C,D15.A,B,D解析：11.Antibodieshavemultiplefunctions,includingneutralizingtoxinsandviruses,opsonizingpathogensforphagocytosisordestructionbyNKcells,activatingthecomplementsystemforpathogenlysis,andregulatingimmuneresponsesbybindingtoFcreceptorsonimmunecellsorbycompetitivebindingtoantigens.12.Professionalantigen-presentingcells(APCs),suchasmacrophages,Blymphocytes(whenactivated),anddendriticcells,possessthemachinery(MHCclassIandIImolecules)toprocessandpresentantigenstoTlymphocytes.13.Innateimmunecellsincludephagocytes(neutrophils,macrophages,eosinophils),naturalkillercells,andantigen-presentingcells.Lymphocytes(BcellsandTcells)arepartoftheadaptiveimmunesystem.14.Interferon-gamma(IFN-g)isakeycytokineproducedbyTh1cellsthatpromotescell-mediatedimmunityagainstintracellularpathogens.Tumornecrosisfactor-alpha(TNF-a)alsocontributestoinflammationandimmuneregulationbutisproducedbyvariouscelltypes.IL-4isassociatedwithTh2responses.15.Immuneregulationinvolvesmechanismstopreventexcessiveorinappropriateimmuneresponses.TheseincludesuppressionbyregulatoryTcells(Tregs),apoptosisofactivatedlymphocytestoterminatetheresponse,antibody-dependentcell-mediatedcytotoxicity(ADCC)whichcaneliminateautologouscellsexpressingantibodies,andtheproductionofanti-inflammatorycytokines(likeIL-10)todampeninflammation.Part3:ShortAnswerQuestions16.Activeimmunityisacquiredwhenthebody'simmunesystemisstimulatedtoproduceitsownantibodiesorTcellsagainstapathogen,oftenfollowinginfectionorvaccination.Thisimmunityisusuallylong-lasting.Passiveimmunityisacquiredbyreceivingpre-formedantibodiesfromanothersource,suchasfrommothertofetusthroughtheplacentaorfromantibody-containingproductslikeimmunoglobulintherapy.Thisimmunityprovidesimmediatebuttemporaryprotection.17.MHCmoleculesareessentialfortheimmunesystemtodistinguishselffromnon-self.MHCclassImoleculespresentendogenouspeptides(frominsidethecell,e.g.,viralproteins)toCD8+cytotoxicTlymphocytes,initiatingcell-mediatedimmunity.MHCclassIImoleculespresentexogenouspeptides(fromoutsidethecell,e.g.,ingestedbyAPCs)toCD4+helperTlymphocytes,whichthencoordinatetheoverallimmuneresponse,includingactivatingBcellsandmacrophages.18.Thecomplementsystemenhancestheabilityoftheimmunesystemtoclearmicrobesanddamagedcells.Itopsonizespathogens,makingthemmoresusceptibletophagocytosis.Itrecruitsinflammatorycellstothesiteofinfectionandcandirectlylysecertainbacteriaandvirus-infectedcellsthroughthemembraneattackcomplex(MAC).19.Clonalselectionistheprocessbywhichlymphocytesencountertheirspecificantigen.Onlythoselymphocyteswhosereceptor(BCRorTCR)canbindtotheantigenareactivated.Theseselectedlymphocytesthenproliferate(clonalexpansion)anddifferentiateintoeffectorcellscapableofmountingaresponseagainstthatspecificantigen.20.Thelper(Th)cellscandifferentiateintodifferentsubsetsbasedonthecytokineenvironmenttheyencounter.Th1cells,drivenbyIL-12,helpcontrolintracellularinfections(likevirusesandsomebacteria)byactivatingmacrophagesandcytotoxicTcells.TheyproducecytokineslikeIFN-gandTNF-a.Th2cells,drivenbyIL-4,helpcontrolextracellularparasites(likehelminths)andareinvolvedinallergicresponsesbyactivatingBcellstoproduceIgE.TheyproducecytokineslikeIL-4,IL-5,andIL-13.Part4:Translation免疫系统具有特异性识别病原体并产生记忆反应的能力，这是其特征。该系统涉及两种主要的淋巴细胞：B细胞和T细胞。B细胞负责产生抗体，而T细胞可以识别并直接杀死被感染的细胞或帮助B细胞产生抗体。B细胞和T细胞的发育分别涉及在胸腺和骨髓中进行的阳性选择和阴性选择过程，这确保了这些细胞能够识别外来抗原，但不会攻击自身组织。Part5:ShortAnswerQuestions(inEnglish)21.Immunologicaltoleranceistheprocessbywhichtheimmunesystemispreventedfrommountingaresponseagainstself-antigens.Itiscrucialbecausefailuretoestablishtoleranceleadstoautoimmunediseases,wheretheimmunesystemattacksthebody'sowntissues,causinginflammationanddamage.Centraltolerance,establishedinthethymus(forTcells)andbonemarrow(forBcells),eliminatesorrendersanergicself-reactivelymphocytes.Peripheraltolerancemechanisms,operatingoutsideprimarylymphoidorgans,alsohelpcontrolself-reactivityinmaturelymphocytescirculatinginthebody.22.TheactivationofaBcelltypicallyinvolvestwosignals.ThefirstsignalisthebindingofaforeignantigentoitsspecificBcellreceptor(BCR)onthesurfaceoftheBcell.ThisengagementleadstoBcellproliferationanddifferentiation.Thesecondsignal,knownasco-stimulation,isprovidedbytheinteractionbetweenco-stimulatorymoleculesonanantigen-presentingcell(APC),suchasCD80/CD86,andtheirreceptors(CD28)ontheBcell.Thisco-stimulationisessentialforfullBcellactivation,preventinganergy.ActivatedBcellsthenundergoclassswitching(ifrequired),affinitymaturation(somatichypermutation),andfinallydifferentiateintoplasmacells(toproducelargeamountsofantibody)andmemoryBcells.23.TheclassswitchistheprocessbywhichaBcellchangestheconstantregion(andthustheeffectorfunctions)ofitsantibodymoleculeafterinitialactivation,withoutalteringthevariableregionthatdeterminesantigenspecificity.ThisprocessistriggeredbycytokinessecretedbyThelpercells(e.g.,Th2cellspromotingIgE,IgG,IgAswitching;Th1cellspromotingIgG1,IgG3switchinginmice).Classswitchingallowstheimmunesystemtotailortheantibodyresponsetothespecifictypeofpathogenencountered(e.g.,IgMforinitialresponse,IgGforlong-termprotection,IgAformucosaldefense,IgEforparasitedefense).24.Cytokinesaresmallproteinsthatactaschemicalmessengersintheimmunesyste