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1、2015贵州省现代预防医学考试题库（2015Guizhoumodernpreventivemedicineexaminationquestionbank）1,theamountofrootformationdependson()A.glazeformerB.dentalpapillaC.toothsacD.epithelialrootsheathE.epithelialseptumThecorrectanswer:E,2.Howmanylayersofepithelialcellsarecoveredintheoriginaloralcavityatthefifthwee
2、koftheembryo?A.1B.2C.3D.4E.ormoreiswrongThecorrectanswer:B3.NucleicacidhybridizationreferstoA.differentnucleicacidchainsaredenaturedandformalocaldoublestrandbetweenthemAsinglestrandofasmallnucleotidepolymer,labeledwitharadioactiveisotopeororganism,whoseendorwholechainisB.C.transportaminoa
3、cidsD.singlestrandDNAintodoublestrandedDNAE.50%doublestrandedDNAdenaturationattemperatureThecorrectanswer:A,4.Thecommonenzymegroupsare()A.carboxylgroup,carbonylgroup,aldehydegroup,ketonebaseB.carboxylgroup,hydroxylgroup,aminogroupandsulfhydrylgroupC.carboxylgroup,carbonylgroup,ketonegroup
4、andacylgroupD.aminogroup,carboxylgroup,sulfhydrylgroupandhydroxylgroupE.hydroxygroup,carbonylgroup,carboxylgroupandaldehydegroupThecorrectanswer:B901,NotbelongingtothevitaminBcoenzymeis()A.pyridoxal-5-phosphateB.cytochromeCC.coenzymeAD.leucovorinE.thiaminepyrophosphateThecorrectanswer:B,9
5、02,ThestatementaboutthekeyenzymeiscorrectA.hasthelowestcatalyticactivityintheenzymesystemB.isoftenanenzymeintheintermediatereactionoftheenzymesystemC.catalyzedreversiblereactionD.theregulationoftheenzymeactivitydoesnotchangethereactionrateofthewholereactionsystemThestartingsubstanceofE.re
6、actionsystemcanregulatethekeyenzymeThecorrectanswer:A,903,Asregardstheregulationofcovalentmodifications,thecorrectoneis()TheA.metaboliteactsontheallostericsiteoftheenzyme,causingconformationalchangesintheenzymeB.whentheenzymeissynthesizedorsecretedinthecell,thereisnoenzymeactivityC.theenz
7、ymeisreversiblycovalentlymodifiedbycertainspecificgroupsundertheactionofotherenzymesTheD.regulationprocesshasnoprogressiveamplificationE.covalentmodificationconsumesmorethanATPandisnoteconomicallyeffectiveThecorrectanswer:C,904,Whichstatementofallostericregulation(o
