细胞生物学英文试卷

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1、细胞生物学英文试卷三（开卷）Eachquestionhasonecorrectansweronly!1.Programmedcelldeath(PCD)A.Occursbyamorphologicallydefinedprocessknownasapoptosis.B.Isthetypeofcelldeaththatoccursnaturallyaspartofthenormaldevelopment.C.Isaprocessregulatedatthegeneticlevel.D.Alloftheabove2.Whichofthefollowingmutations

2、inatumorsuppressorgenewillmostlikelynotresultincancer?A.Pointmutant.B.Deletion.C.Generearrangement.D.Alloftheabove.3.Cellularproto-oncogenes(c-onco)A.Areinvolvedintheregulationofnormalcellulargrowthanddifferentiation.B.Arenegativeregulatorsofcellproliferationbecausetheyareinactiveinnorm

3、alcells.C.Arederivedfromtheoncogenesoftumorviruses.D.Areexpressedintumorcellsbutnotinnormalcells.4.AtanaphaseBA.Microtubulesshortenatkinetochore.B.Motorproteinspullchromosomestowardspole.C.Twopolesbegintoseparatefromeachothers.D.BothAandB.5.MovementofchromosomesatmitosisrequiresA.Kineto

4、chores.B.Microtubules.C.Microtubule-basedmolecularmotors.D.Alloftheabove.6.Whatisthemainfunctionofcyclinproteins?8A.Theyinitiateasignaltransductioncascadethatleadstochangesinthecell’sbehavior.B.TheyregulatethecelldivisionbybindingandactivatingCDKenzymes.C.Theyarethemainproteincomponents

5、ofthekinetochore.D.Theyblockcellcycleprogressionwhenconditionsarenotappropriateforgrowth.7.PolytenechromosomesA.ArethechromosomeduringmeioticprophaseI.B.Consistofthousandsofcopiesofeachchromosomealignedwithoneanother.C.Arefoundinsalivaryglandcellsofthedrosophila(fruitfly).D.BothBandC.8.

6、Whenabout200bpofDNAwrapsaroundacoreofhistoneproteins,thestructureisreferredtoasaA.Nucleosome.B.Chromosome.C.Chromatin.D.Heterochromatin.9.Whichofthefollowingisnotthebasicelementofchromosomes?A.AutonomouslyreplicatingDNAsequence,ARS.B.CentromereDNAsequence,CEN.C.TelomereDNAsequence,TEL.D

7、.Homogenouslystainedregion,HSR.10.CellbindingdomaininfibronectinscontainA.RGDsequences.B.KDELsequences.C.Gly-XYsequences.D.PESTsequences.11.TheadhesionmoleculesindesmosomesandadhesionbeltsareA.Cahesin.B.Selectin.C.Intergerin.8D.BothAandC12.Whattypeofcellattachmentismostimportan