细胞生物学英文试卷.pdfVIP

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细胞生物学英文试卷三（开卷）

Eachquestionhasonecorrectansweronly!

1.Programmedcelldeath(PCD)

A.Occursbyamorphologicallydefinedprocessknownasapoptosis.

B.Isthetypeofcelldeaththatoccursnaturallyaspartofthenormal

development.

C.Isaprocessregulatedatthegeneticlevel.

D.Alloftheabove

2.Whichofthefollowingmutationsinatumorsuppressorgenewillmost

likelynotresultincancer?

A.Pointmutant.

B.Deletion.

C.Generearrangement.

D.Alloftheabove.

3.Cellularproto-oncogenes(c-onco)

A.Areinvolvedintheregulationofnormalcellulargrowthanddifferentiation.

B.Arenegativeregulatorsofcellproliferationbecausetheyareinactivein

normalcells.

C.Arederivedfromtheoncogenesoftumorviruses.

D.Areexpressedintumorcellsbutnotinnormalcells.

4.AtanaphaseB

A.Microtubulesshortenatkinetochore.

B.Motorproteinspullchromosomestowardspole.

C.Twopolesbegintoseparatefromeachothers.

D.BothAandB.

5.Movementofchromosomesatmitosisrequires

A.Kinetochores.

B.Microtubules.

C.Microtubule-basedmolecularmotors.

D.Alloftheabove.

6.Whatisthemainfunctionofcyclinproteins?

A.Theyinitiateasignaltransductioncascadethatleadstochangesinthecell’s

behavior.

B.TheyregulatethecelldivisionbybindingandactivatingCDKenzymes.

C.Theyarethemainproteincomponentsofthekinetochore.

D.Theyblockcellcycleprogressionwhenconditionsarenotappropriatefor

growth.

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7.Polytenechromosomes

A.ArethechromosomeduringmeioticprophaseI.

B.Consistofthousandsofcopiesofeachchromosomealignedwithone

another.

C.Arefoundinsalivaryglandcellsofthedrosophila(fruitfly).

D.BothBandC.

8.Whenabout200bpofDNAwrapsaroun