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1、Part1SingleBestChoiceQuestions(40?1point=40pts)Instruction:(1)MarktheletterthatcrespondstotherightanswerinthefmattedANSWERSHEETwith2BPENCIL.Sincethemarksarereadbycomputeranswersinthisquestionsheetwillnotbecollected.(2)Fo

2、nequestiononlyoneletterispermittedtobedarkenedotherwiseitwillberecognizeaswrongbythecomputer.(3)DonotfgettomarkyourstudentIDnumberwriteinyourname.1.Bacteriathatlackcellwallsdonotsynthesizetheprecurssofpeptidoglycanarecal

3、ledA.SpirochetesB.ChlamydiaeC.MycoplasmasD.LfmsE.Bacilli2.EachofthefollowingisatypicalpropertyofobligateanaerobeEXCEPTA.TheygenerateenergybyusingthecytochromesystemB.TheygrowbestintheabsenceofairC.Theylacksuperoxidedismu

4、taseD.TheylackcatalaseE.Tetanusiscausedbyatypicalobligateanaerobe3..WhichoneofthefollowingagentslacksnucleicacidA.BacteriaB.VirusesC.ViroidsD.PrionsE.Protozoa4.Whichoneofthefollowingmostcrectlydescribesvaccinescontaining

5、liveattenuated(weaken)pathogensA.PathogendoesnotmultiplyinhumanhostsB.TheyprovideextendedsometimeslifelongimmunityC.ThereisnopossibilityfreversiontopathogenicfmD.TheyprovidelittlecellmediatedimmunityE.Theyareadministered

6、byinjection5.EachofthefollowingstatementsconcerningthekillingofbacteriaiscrectEXCEPTA.A70%solutionofethanolkillsmeeffectivelythanabsolute(100%)ethanolB.Anautoclaveusessteamunderpressuretoreachthekillingtemperatureof121oC

7、C.ThepasteurizationofmilkkillspathogensbutallowsmanyganismsspestosurviveD.IodinekillsbycausingthefmationofthyminedimersinthebacterialDNAD.ExotoxinscanbeconvertedtotoxoidsE.Exotoxinsareusuallycomposedoftwosubunitsincludin

8、gbindingsubunitactivesubunit13.EachofthefollowingstatementsconcerningthekillingofbacteriaiscrectEXCEPTA.A70%solutionofethanolkillsmeeffectivelythanabsolute(100%)ethanolB.Anautoclaveusessteamunderpressuretoreachthekilling

9、temperatureof121oCC.ThepasteurizationofmilkkillspathogensbutallowsmanyganismsspestosurviveD.IodinekillsbycausingthefmationofthyminedimersinthebacterialDNAE.Ultravioletiswidelyusedtodisinfecttheairofaroom14.Eachofthefollo

10、wingstatementsconcerningthenmalflaiscrectEXCEPTA.ThenmalflaofthecolonconsistspredominantlyofanaerobicbacteriaB.ThepresenceofthenmalflapreventscertainpathogensfromcolonizingtheupperrespiratytractC.Fungiegyeastsarenotmembe

11、rsofthenmalflaD.ganismsofthenmalflaarepermanentresidentsofthebodysurfacesE.Nmalflamayoccasionallycausediseases15.ThegrowthrateofbacteriaduringtheexponentialphaseofgrowthisA.ZeroB.IncreasingC.ConstantD.DecreasingE.Nagtive

12、16.WhichofthefollowingstatementsregardingvirusacteristrueAVirusesreplicatebybinaryfissionBAllRNAvirusesaresphericalinshapeCHelicalnucleocapsidsarefoundwithsinglestredDNAvirusesDSomeviruseswithDNAgenomescontainaprimitiven

13、ucleus.EViralsurfaceproteinsprotecttheviralgenomefromnucleases17.A40yearoldwomanisdiagnosedwithcervicalcancer.Thiscanceriscommonwldwidehasasexuallytransmittedviraletiology.Thecausativeagentsofhumancervicalcancerinclude:A

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