组织学自我测试题第一部分.doc

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1、SELF-ASSESSMENTINHISTOLOGYQUESTIONS一,THECELL1The'fluidmosaic'modelofmembranestructureproposesthattheplasmamembraneconsistsofabilaterofphospholipidmoleculesseparatedbyalayerofprotein.(F)2Ingeneral,hydrophobic(lipophilic)moleculesareabletodiffusefreelyacrossmembranes.(T)3Thech

2、olesterolmoleculeswhichareassociatedwithplasmamembranesformtheso-calledglycocalyxofsomeeukaryoticcells.(F)4Thetrilaminateappearanceoftheplasmamembranewhenviewedwithelectronmicroscopyisexplicableintermsofthe'dynamicpores'modelofmembranestructure.(T)5Largemolecular-weightpolys

3、accharidemoleculesform'dynamicpores'fortransportofmoleculessuchassodiumionsintocells.(F)6Lipid-solublemoleculessuchasethanolcrossmembranesbytheprocessdescribedas'facilitateddiffusion'.(F)7'Facilitateddiffusion'permitsthetransportofmoleculesacrossmembranesagainstaconcentratio

4、ngradient.(F)8The'sodiumpump'isanexampleofanactivetransportmechanismsinceitiseffectiveagainstaconcentrationgradient.(T)9Onlyactivemembranetransportprocessesareenhancedbyincreasingtheplasmamembranesurfacearea.(F)10Phagocytosisisthereverseprocessofendocytosis.(F)11Primarylysos

5、omesareelectron-lucentstructuresboundedbyamembrane.(F)12Phagosomesarealsoreferredtoaslipofuscingranules.(F)13Autophagyisoneoftheprocessesinvolvedinthecontinuousturnoverofcytoplasmicorganelles.(T)14Multivesicularbodiesareastorageformoflysosomalprecusors.(F)15Alkalinephosphata

6、seactivityisausefulhistochemicalmarkerforlysosomes.(F)16Cellularenzymesaresubjecttowearandtearandarecontinuouslyturnedover,whereasstructuralproteinsinthecellarecompletelystable.(F)17MessengerRNAsynthesisinvolvestranscriptionofpartofthegenome.(T)18RibosomalRNAissynthesisedint

7、henucleus.(T)19Eachribosomeconsistsoftwosubunits,oneofwhichiscomposedofRNAandtheothercomposedofribosomalproteins.(F)20UnlikemessengerandribosomalRNA,transferRNAissynthesisedbyribosomes.(F)21Acellwithoutanucleuscouldnotbeinvolvedinproteinsynthesis.(F)22Theprincipalnuclearcons

8、tituentsareDNA,RNAandprotein.(T)23Heterochromatinrepresentsthatpartofthegen