PART1TRUEORFALSE(1pointeach)

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1、Page25CodeNumber____________PART1:TRUEORFALSE(1pointeach)Pickupyournumber2pencilandyourscantronsheetandgetrolling!PutyourNAME,SUID#,andTESTCODENUMBERonbothsidesofthescantronimmediately.Pleasebubblein'A'ifthestatementisTRUEand'B'ifthestatementisFALSE.Remembertobecarefulwhenbubblinginyouranswe

2、r.ERASECOMPLETELY.1.Boththeahelixandthebsheetarestablesecondarystructuresbecauseofhydrogenbonds.2.Enzyme-substrateandreceptor-ligandinteractionsusenoncovalentbondsratherthancovalentbonds,becausenoncovalentbondsallowdynamicassociationanddisassociationofthesemolecules.3.Proteinphosphatasesaddp

3、hosphategroupstoproteins.4.BindingofGTPorphosphorylationmayinduceallostericchangesinproteins.5.LinkingthereactionX->Ytoasecond,energeticallyfavorablereactionY->Zwillshifttheequilibriumconstantofthefirstreaction.6.TheaminoacidsequenceHis-Arg-Glu-Asp-Ser-Lys-Lyscouldbeasignalsequencethatdirect

4、sproteinstotheER.7.TheconversionofNAD+toNADHisanoxidationreaction.8.Althoughcolchicineandtaxolhaveoppositeeffectsonmicrotubulepolymerization,theybothultimatelypromotemitoticcelldivision.9.ThehydrolysisofaGTPmoleculeboundtoaG-proteinactivatesadenylylcyclaseandsignalpropagation.10.Onehormoneca

5、ncauseamultitudeofeffectsinthetargetcell.11.Tlymphocytesoriginateandmatureinthebonemarrow.12.IfoneisinfectedwithHIV,thenonehasAIDS.13.Inmanycancercells,thepathwaysthatnormallyleadtoinhibitionofthecyclin/cdkcomplexesafterDNAdamage,areNOTfunctional.14.Ifawomanwithametastaticbreastcancerdevelop

6、satumorinherlung,thecellsinthelungtumorarealwaysidenticaltothecellsinthebreasttumor.15.Astemcellisatypeofgermcell.Page25CodeNumber____________1.Infemales,primaryoocytesentermeiosisbeforebirth,whereasinmales,primaryspermatocytesentermeiosisafterpuberty.2.Thezonapellucidapreventsoccurrenceofec

7、topicpregnancies.3.Cytokines(suchasinterleukins)canbesecretedbypre-implantationblastocystsaswellasbyT-helpercells.4.MethylationofDNAisusedtopreventexpressionofcertaingenes.5.Growthandagingoccursimultaneously,startingatthemomentoffertilization.6.The