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ASU BIO 340 EXAM 3 QUESTIONS WITH CORRECT ANSWERS GRADED TO A+
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ASU BIO 340 EXAM 3 QUESTIONS WITH CORRECT ANSWERS GRADED TO A+
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ASU BIO 340 EXAM 3 QUESTIONS WITHCORRECT ANSWERS GRADED TO A+
WhatBwillBbeBtheBeffectBonBtranscriptionBwhenBanBinhibitorBisBinBplay?
A.BAllowBtranscriptionBB.BPreventBtranscriptionB-BcorrectBanswer-
BBExplanation:BAnBinhibitorBpreventsBactivatorBfromBbindingBtoBDNA;BactivatorsBareBusedBinBpositiveBregul
ationB(increasingBtranscription)B-
Bthus,BtheBinhibitorBpreventsBtheBactivatorBfromBpositiveBregulatingB(increasing)Btranscription.
WhatBwillBbeBtheBeffectBonBtranscriptionBwhenBanBinducerBisBinBplay?B
A.BAllowBtranscriptionBB.BPreventBtranscriptionB-BcorrectBanswer-
ABExplanation:BWhenBanBinducerBisBinBplay,BitBwillBallowBtranscription.
ForBaBgeneBunderBpositiveBcontrol,BwhichBofBtheBfollowingBwouldBpreventBtranscription?B
A.BRepressorBB.BCorepressorBC.BInducerBD.BEffectorBE.BInhibitorB-BcorrectBanswer-
EBExplanation:BPositiveBregulationBincludesBactivatorsB(affectedBbyBeffectorsBandBinhibitors);BinhibitorsBpre
ventBactivatorBfromBbindingBtoBDNA,BthusBpreventingBtranscription.
ForBaBgeneBunderBnegativeBcontrol,BwhichBofBtheBfollowingBwouldByouBexpectBtoBfindBboundBtoBtheBrepress
orBifBthereBisBactiveBtranscription?BA.BRepressorBB.BCorepressorBC.BInducerBD.BEffectorBE.BInhibitorB-
BcorrectBanswer-
CBExplanation:BInBnegativeBregulation,BthereBareBrepressorsB(affectedBbyBcorrepressorsBandBinducers).BIfBth
ereBwereBaBcorepressor,BtheBrepressorBwouldBsuccessfullyBbindBtoBtheBoperatorBandBpreventBtranscription.
BInducers,Bhowever,BpreventBtheBbindingBofBtheBrepressorB-
BthusBcausingBaBpreventionBofBitBdoingBitsBjob,BandBallowingBtranscription.
WhichBmoleculeBservesBasBtheBinducerBforBtheBlacBoperon?B
A.BcAMPBB.BGlucoseBC.BLactoseBD.BAllolactoseB-BcorrectBanswer-
DBExplanation:BAllolactoseBisBtheBmoleculeBthatBbindsBtoBrepressorBprotein,BmakingBitBunableBtoBbindBtoBth
eBoperator.
WhichBofBtheBfollowingBconditionsBwillBresultBinBtheBgreatestBlevelsBofBtranscriptionBofBtheBlacBoperon?B
A.BLactoseBabsent,BglucoseBabsentBB.BLactoseBabsent,BglucoseBpresentBC.BLactoseBpresent,BglucoseBpresent
BD.BLactoseBpresent,BglucoseBabsenB-BcorrectBanswer-
DBExplanation:BFromBtheBperspectiveBofBtheBcell,BitBisBmostBefficientBtoBrepressBexpressionBofBtheBgenesBall
, owingBforBmetabolismBofBlactoseBwhenBit'sBabsent,BtoBallowBitBwhenBpresent,BbutBonlyBtoBprioritizeBitBwhe
nBglucoseB(theBpreferredBfoodBsource)BisBabsent.BInBC,BallolactoseBwillBalsoBbeBpresent,BallowingBtranscripti
on,BbutBpositiveBregulationB(i.e.BincreaseBinBtranscription)BonlyBhappensBasBinBD,BwhenBglucoseBisBabsent.
WhichBofBtheBfollowingBmutationsBwillBresultBinBtheBlowestBlevelBofBtranscriptionBofBtheBlacBoperonBwhenBl
actoseBisBpresent?B
A.BAnBoperatorBmutationBthatBpreventsBbindingBofBtheBlacBrepressorBB.BABmutationBinBtheBlacBrepressorBth
atBpreventsBitBfromBbindingBtoBtheBoperatorBC.BABmutationBinBCAPBthatBpreventsBitBfromBbindingBtoBtheBCA
PBbindingBsiteBD.BABmutationBinBtheBlacBrepressorBthatBpreventsBitBfromBbindingBallolactoseB-
BcorrectBanswer-DBExplanation:BAB-
BifBrepressorBcan'tBbind,BtheBgeneBwillBbeBpermanentlyBturnedBon,BthereBwillBbeBtranscription.BBB-
BexactlyBtheBsameBeffectBasBA.BCB-
B"temptingBbutBwrong";BCAPBcan'tBbind,BwillBcauseBlowerBbutBnotBtotalBpreventionBofBtranscription.BDB-
BcorrectBanswer;BifBtheBinducerBisBtotallyBineffective,BthenBtheBrepressorBwillBpermanentlyBbindBtoBoperato
rBandBtotallyBpreventBtranscription.
TheBregulatoryBelementsBinBtheBlacBoperonBactBto:B
A.BRepressBtranscriptionBwhenBthereBisBnoBlactoseBpresentBB.BRepressBtranscriptionBwhenBthereBisBlactoseB
presentBC.BActivateBtranscriptionBwhenBthereBisBnoBglucoseBpresentBD.BActivateBtranscriptionBwhenBthereBi
sBglucoseBpresentBE.BABandBCB-BcorrectBanswer-
EBExplanation:BTheBcellBwantsBtoBbothBrepressBtranscriptionBwhenBthereBisBnoBlactoseBpresentBandBactivate
BitBwhenBglucoseBisBabsentB(CB"slightlyBlessBgood"BanswerBthanBA,BbutBstillBtrue).BSimilarBtoBClickerBQuestio
nB6
ABbacteriumBneedsBtoBmakeBaBcertainBlipidBthatBitBcannotBobtainBfromBitsBenvironment.BThatBsameBlipidBisB
involvedBinBregulatingBtheBexpressionBofBtheBenzymesBthatBmakeBit.BWhichBofBtheBfollowingBisBtheBmostBlik
elyBregulatoryBfunctionBofBtheBlipid?
BA.BEffectorBB.BActivatorBC.BInducerBD.BCo-repressorBE.BOperatorB-BcorrectBanswer-
DBExplanation:BIfByouBhaveBthatBlipid,ByouBwouldBwantBitBtoBnotBmakeBanyBmore.BSo,BifByouBhaveBtheBlipidBi
nBtheBcell,ByouBwouldBwantBtoBturnBoffBtheBtranscription,BsoBitBwouldBlikelyBbeBinvolvedBinBnegativeBregulati
on.BEffectorsBandBactivatorsBareBbothBinvolvedBinBpositiveBregulation.BAnBinducerBisBunderBnegativeBregulat
ionBbutBitsBjobBisBtoBturnBonBtranscription.BABco-
repressorBwillBonlyBturnBtheBgeneBoffBifBthereBisBaBsignalBtheBcellBcanBsense.BOperatorBisBaBpieceBofBDNA.
ABbacteriumBisBunableBtoBtransportBlactoseBintoBtheBcellBtoBbeBbrokenBdown.BWhichBgeneBisBlikelyBmutated
BinBthisBbacterium?B
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