中國大學mooc《分子生物學(福建農林大學) 》章節(jié)測試答案

title分子生物學(福建農林大學)中國大學mooc答案100分最新版content作業(yè)第三單元基因和染色體-2（基因概念的多樣性）Chapter2GeneandChromosome_Homework1、請上傳Chapter2GeneandChromosome上直播課和慕課過程中所記的筆記（可以是提綱式或是思維導圖，需要記錄重點和難點，特別要記錄下英文PPT中的專業(yè)單詞，筆記請紙質記錄，拍照后上傳）

要求：1.有章節(jié)題目；2.要點大綱；3.記錄下重點難點；4.可以用思維導圖式；5.記錄下英文專業(yè)詞匯；6.不能出現(xiàn)個人信息。

評分規(guī)則:

100-99：有章節(jié)題目和要點大綱，邏輯清楚，內容完整詳細，重點難點突出，有記下英文專業(yè)詞匯，且書寫工整；90-89：有章節(jié)題目和要點大綱，邏輯清楚，內容完整，有重難點，但不突出，只有少數(shù)英文詞匯；書寫工整；80-79：有章節(jié)題目和要點大綱，邏輯清楚，但內容和重難點不夠完整，沒有英文詞匯，書寫不夠工整；70-69：有章節(jié)題目，但是邏輯不清楚，但內容和重難點不夠完整，沒有英文詞匯，書寫不工整，版面很亂60：有交筆記，但是內容非常讓人不滿意。0：沒有提交筆記第三單元基因和染色體-2（基因概念的多樣性）Chapter2GeneandChromome_Test1、Watson&Crickwonthenobleprizein1962fortheirdiscoveriesconcerning:A:theinteractionbetweentumourvirusesandthegeneticmaterialofthecell

B:themobilegeneticelements

C:themolecularstructureofnucleicacids

D:theinventionofthePCRmethod

答案:themolecularstructureofnucleicacids2、Mostofthestabilityofthedouble-strandedDNAstructureistheresultofA:

hydrogenbondingbetweenpurines.

B:thephosphodiesterbackbone.

C:theangleoftheplanesofthebaseswithrespecttothehelixaxis.

D:thestackinginteractionsbetweenbasepair.

答案:thestackinginteractionsbetweenbasepair.3、ItiseasiertomeltDNAricherinATthanGCbecauseA:itismoreheatsensitive.

B:thereisonelesshydrogenbondinanATbasepair

C:

thehelixpitchislongerinATrichregions.

D:Allofthethreestatements.

答案:thereisonelesshydrogenbondinanATbasepair4、AsB-DNAisgraduallyheated,theabsorbanceat260nmA:increases.

B:decreases.

C:staysthesame.

D:

Itisunpredictable.

答案:increases.5、WhatarethetargetandtheprobeoftheSouthernblotting？A:DNA,DNA

B:RNA,RNA

C:Protein,antibody

D:

Noneoftheabove.

答案:DNA,DNA6、SupercoilingofpurecircularDNAisaresultof

__.

A:underwindingoroverwindingofthehelix

B:thelonglengthofthestrands

C:thelackofassociatedhistones

D:theactivityofexonucleases

答案:underwindingoroverwindingofthehelix7、Whichofthefollowingisanexampleofhighly-repetitiveDNA?A:Globingenefamily

B:Histonegenecluster

C:MinisatelliteDNA

D:rDNAgenefamily

答案:MinisatelliteDNA8、HistonesarefoundincloseassociationwithDNA.Whichofthefollowingstatementsisincorrect?A:Anucleosomecoreiscomposedof~146bpofDNAandahistoneoctamer.

B:HistoneH1binds

tolinkerDNA.

C:Thereareonlyfourtypesofhistones.

D:Nucleosomesareevenlydistributionwithinchromatin.

答案:Thereareonlyfourtypesofhistones.9、DNAwrapsaroundanoctamerofhistonestoformbead-likestructurescalled

__.A:nucleoids

B:nucleosomes

C:nucleoli

D:chromatids

答案:nucleosomes10、Whatistheapproximatediameterofachromatinfiber?A:3nm

B:30nm

C:300nm

D:3mm

答案:30nm11、Whatistheorderofpackagingofchromatinineukaryoticcellsfromsmallesttolargestsize?A:double-helix→solenoid螺線管→nucleosome→chromosome

B:double-helix→chromatin→solenoid→chromosome

C:single-strandedDNA→chromatin→histones→chromosome

D:double-helix→nucleosomes→solenoid→chromosome

答案:double-helix→nucleosomes→solenoid→chromosome12、HowmightmitochondrialDNAbedistinguishedfromeukaryoticnuclearDNA?A:MitochondrialDNAisintheZconformation,nuclearDNAisintheBconformation.

B:MitochondrialDNAismethylated,nuclearDNAisnot.

C:NuclearDNAislinear,mitochondrialDNAarecircular.

D:Theycannotbedistinguishedandmustbeclearlyseparateduringpurification

答案:NuclearDNAislinear,mitochondrialDNAarecircular.13、Whichofthefollowingstatementsisnotcorrectconcerningtotheprokaryoticgenomeandeukaryoticgenome?A:Therearemanynon-codingDNAsineukaryoticgenome.

B:DNAarealmostnakedinprokaryotes.

C:Therearemanyoperonsineukaryoticgenome.

D:ProkaryoticgenomeisasinglecircularDNAmolecule.

答案:Therearemanyoperonsineukaryoticgenome.14、WhichdoesnotapplytomostbacterialDNA?

A:Circular.

B:Relaxed.

C:Notpackedintonucleosomes.

D:Supercoiled.

答案:Relaxed.

15、Inanucleicacidmolecule,nucleotidesarejoinedintoapolymerbythe

__phosphodiesterbonds.A:2′,3′

B:2′,4′

C:3′,4′

D:3′,5′

答案:3′,5′16、AllgenomesarecomposedofDNA.

A:正確

B:錯誤

答案:錯誤17、Thetwostrandsofdouble-strandedDNAhavethesamecontentofeachofthebasesA,T,GandC.A:正確

B:錯誤

答案:錯誤18、Thesupercoilingofdouble-strandedcircularDNAcanberemovedbycleavingasinglephosphodiesterbondononlyonestrand(nick).

A:正確

B:錯誤

答案:正確19、ProkaryoticDNAisorganizedintoprotein-DNAstructurescallednucleoids.

A:正確

B:錯誤

答案:正確20、HistoneH1ispartofthehistoneoctamer.A:正確

B:錯誤

答案:錯誤21、Heterochromatinmakeupmostofthegenome.A:正確

B:錯誤

答案:錯誤22、ThemaximumC-valueisalwaysgreaterthanminimumC-valueinanorganism.A:正確

B:錯誤

答案:錯誤作業(yè)第四單元DNA的復制Chapter3DNAreplication-homework1、請上傳Chapter3DNAreplication上直播課和慕課過程中所記的筆記（可以是提綱式或是思維導圖，需要記錄重點和難點，特別要記錄下英文PPT中的專業(yè)單詞，筆記請紙質記錄，拍照后上傳）

要求：1.有章節(jié)題目；2.要點大綱；3.記錄下重點難點；4.可以用思維導圖式；5.記錄下英文專業(yè)詞匯；6.不能出現(xiàn)個人信息。

評分規(guī)則:

100-90：有章節(jié)題目和要點大綱，邏輯清楚，內容完整詳細，重點難點突出，有記下英文專業(yè)詞匯，且書寫工整；89-80：

有章節(jié)題目和要點大綱，邏輯清楚，內容完整，有重難點，但不突出，只有少數(shù)英文詞匯；書寫工整；79-70：有章節(jié)題目和要點大綱，邏輯清楚，但內容和重難點不夠完整，沒有英文詞匯，書寫不夠工整；69-61：有章節(jié)題目，但是邏輯不清楚，但內容和重難點不夠完整，沒有英文詞匯，書寫不工整，版面很亂60：有交筆記，但是內容非常讓人不滿意。0：沒有提交筆記第四單元DNA的復制Chapter3DNAreplication-test1、AllofthefollowingstatementsaboutDNAreplicationinprokaryotesaretrueexcept:A:DNAreplicationisconservative.

B:DNAsynthesisoccursinthe5’to3’direction.

C:Requiresa3’OHtoinitiatereplicationwhichisprovidedbyanRNAprimer.

D:

DNAreplicationinitiatefromspecificorigin.

答案:DNAreplicationisconservative.2、E.coliisgrownonamediumcontaining15Nforalongtime.Cellswerethentransferredtomediumcontainingonlynormal14N.DNAsampleswereobtainedforanalysisafterthreeroundsofreplicationandcentrifugedonadensitygradient.Howmanybandscanwesee?A:OnewithDNAcontainingboth15Nand14N.

B:Two,onewithDNAcontainingonly15NandonewithDNAcontainingonly14N.

C:Two,onewithDNAcontainingboth15Nand14NandonewithDNAcontainingonly14N.

D:Three,onewithDNAcontainingonly15N,onewithDNAcontainingboth15Nand14NandonewithDNAcontainingonly14N.

答案:Two,onewithDNAcontainingboth15Nand14NandonewithDNAcontainingonly14N.3、WhichDNApolymeraseismostresponsibleforchainelongationinE.coli?

A:DNApolymeraseI.

B:

DNApolymeraseII.

C:DNApolymeraseIII.

D:DNApolymeraseIV.

答案:DNApolymeraseIII.

4、The3′→5′exonucleaseactivityofE.coliDNApolymeraseIIIaccountsforthe

__ofpolymerization.

A:lowerrorrate

B:

highspeed

C:directionality

D:Alloftheabove

答案:lowerrorrate5、TheelongationofthelaggingstrandduringDNAsynthesis:A:Inthe3’

to5’direction

B:ProducesOkazakifragments

C:Polymerizesinthedirectionofforkmovement

D:Doesnotrequireatemplatestrand

答案:ProducesOkazakifragments

6、

InE.coli,theRNAprimeratthebeginningofeachOkazakifragmentisremovedbyA:DNApolymeraseI.

B:DNApolymeraseII.

C:DNApolymeraseIII.

D:

DNApolymeraseV.

答案:DNApolymeraseI.7、OkazakifragmentsareA:thesmallestsubunitsofDNApolymeraseIII

B:shortstretchesofDNAformedonthelaggingstrand

C:shortRNAprimersneededforinitiationofpolymerization

D:fragmentsofDNApolymeraseIthatlack5′→3′exonucleaseactivity

答案:shortstretchesofDNAformedonthelaggingstrand

8、Fragmentsonthelaggingstrandarejoinedbytheenzyme

__.A:DNApolymeraseI

B:DNAsynthase

C:DNAprimosome

D:DNAligase

答案:DNAligase

9、Whichproteinsareresponsiblefortheunwindingofthedouble-strandedDNAduringreplication?A:Ligases.

B:Helicases.

C:Topoisomerases.

D:Primases.

答案:Helicases.10、

InE.coli,

__helpsregulatethefrequencyofDNAreplication.A:DnaA

B:DnaB

C:Tus

D:RecA

答案:DnaA11、WhatisthefunctionofDNAtopoisomerases?A:

CleavingnucleotidesfromtheendsofDNA.

B:Addingorremovingsupercoils.

C:Methylationofthenitrogenousbases.

D:Methylationofthenitrogenousbases.

答案:Addingorremovingsupercoils.

12、AmajordifferencebetweenprokaryoticandeukaryoticDNAreplicationmechanismsisA:noOkazakifragmentsaremadeineukaryotes.

B:bothleadingandlaggingstrandsarecontinuousineukaryotes.

C:noprimersynthesisisneededineukaryotes.

D:thereplicationforkmovesslowerineukaryotes.

答案:thereplicationforkmovesslowerineukaryotes.13、

FunctionsofDNApolymerasesandaccessoryproteinsineukaryoticDNAreplicationincludeA:PCNAprotein,aslidingclampunitforDNA.

B:

DNApolymeraseα,initiation

thesynthesisofnewstrands.

C:RPAprotein,andequivalentofSSBproteinsinbacteria.

D:Alloftheabove.

答案:Alloftheabove.

14、DNAreplicationineukaryotes:A:usuallystartsatthesameplaceeverytime

B:onlyinvolve2differentDNApolymerases

C:isfasterthaninbacterialDNAreplication

D:alloftheabovearefalse

答案:alloftheabovearefalse15、Whichofthefollowingaretrue

statementsregardingtelomeres:A:theyconsistofashortrepeatingsequence

B:theyareprimarilyineukaryotes

C:theyarelocatedatchromosomeendsandstabilizelinearchromosomes

D:

alloftheabove

答案:

alloftheabove16、Telomerase

isakindof:A:RNApolymerase

B:DNApolymerase

C:

primase

D:reverse

transcriptase

答案:reverse

transcriptase17、ThemethylationofGATCsequencesinE.coli

A:isperformedbythedammethylase

B:isdelayedfor~10minafterDNAsynthesis

C:

isrelatedtotheinitiationofDNAreplication.

D:alloftheabove

答案:alloftheabo