DNA, RNA, Protein Synthesis, Gene Regulation Study Guide PDF
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This document is a study guide for DNA, RNA, protein synthesis, and gene regulation. It covers the structure, function, and replication of DNA and RNA, as well as the processes of protein synthesis and gene regulation. Keywords include DNA, gene regulation, and protein synthesis.
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DNA,RNA,ProteinSynthesis,GeneRegulationCh10 Describethefollowingscientists'DNAexperimentsand/ordiscoveries: ○ Griffith-“transformingfactor”from1stbacteriatransferredtothe2nd ○ HersheyandChase-Demonstratedtha...
DNA,RNA,ProteinSynthesis,GeneRegulationCh10 Describethefollowingscientists'DNAexperimentsand/ordiscoveries: ○ Griffith-“transformingfactor”from1stbacteriatransferredtothe2nd ○ HersheyandChase-DemonstratedthatDNAwashereditarymaterial. ○ Franklin-Photo51revealedthehelicalnatureofDNA ○ WatsonandCrick-ModelofDnaandbasepairing,wonaNobelprize. ○ Chargaff -AtoTamountsareequaltoCtoGamounts. ○ Avery-RevealedthatthetransformingagentinbacteriawasDNA. ○ BeadleandTatum-Onegenemakesonespecificprotein. D iagramanddescribethestructureandreplicationofDNAandtheroleofDNA polymerase.nucleotides,DNApolymerases,helicase, ligaseUntwists. **Sequenceofbasesdeterminegenes** ○ Structure: ○ Nucleotidesequencejoinedbycovalentbonds betweensugarandanegativephosphate.Bases areconnectedbyhydrogen(weaker)bonds. ○ BasesareAdenine,Cytosine,Thymine (Pyrimidine/single ring)andGuanine (Purine/doublering). SugarisDeoxyribose-5 carbonringmissinganoxygenatom. Replication: ○ InNucleus,ParentDNAuntwists ○ Thenstrandsseparate ○ Thenbasesincytoplasmattachtocomplementary bases ○ 2DaughterDNAmoleculesrewindasitforms. ○ OldDNAusedasatemplatefornewDNA ○ Leadingstrandtowardstheunzip,laggingstrandtowardstheoutside.Lagging strandmarksOkazakiFragments. ○ DNAPolymerase=Enzymeswhichmakecovalentbondsbetweennucleotides ofthenewstrands. ○ Withproteins,canrepairDNAatarateof50nucleotidespersecond. ○ 1/1billionincorrectlypaired. **DNAdamagedbyUV/Xrays,toxicchemicalsandviruses.** ○ Ensuresthatallcellssharethesamegeneticinformationandcanbepassed down. D iagramanddescribethestructure,formsandrolesofRNAmolecules,andtheroleof RNApolymerases. ○ mRNA: asinglestrandeddnamoleculewithriboseinsteadofdeoxyriboseand uracilinplaceofthymine. ○ tRNA: anticodonsiteaswellasanaminoacid bondingsite,aswellasAandPsites. AandPsitesdetachfromthetRNAto findaminoacids. AnticodonsdecodethemRNAsoitcan betranslatedintoaprotein. ○ rRNA: RibosomalRNA.Theystarttofoldto maketheribosomalsubunit. ○ RNApolymerase AttachestotheDNApromoternucleotidesequenceonDNA. RNAissynthesized. CompareandcontrastDNAandRNAmoleculesinstructureandfunction. Feature DNA(Deoxyribonucleic RNA(RibonucleicAcid) Acid) Sugar Deoxyribose Ribose Strands ouble-stranded(usually D Single-stranded formsadoublehelix) NitrogenBases denine(A),Thymine(T), A denine(A),Uracil(U) A Cytosine(C),Guanine(G) replacesThymine(T), Cytosine(C),Guanine(G) Function toresandtransmitsgenetic S Involvedinproteinsynthesis, information generegulation Types Onemaintype ultipletypes:mRNA M (messenger),tRNA(transfer), rRNA(ribosomal) LocationinCells Primarilyinthenucleus oundinboththenucleus F andcytoplasm Replication Self-replicating ynthesizedfromDNA S (transcription),doesnot self-replicate EnzymesInvolved DNApolymerase NApolymerase(for R transcription) D iagramanddescribethe3stepsinmRNAprocessingintranscription,the3stepsin translation,andaminoacidsequencing/proteinsynthesisusingthefollowing: ○ Codonchart AchartthatisusedtotranslateacodonofmRNA(Atriplet3nucleotides) toasingularaminoacid. Thechainofaminoacidsthenformproteins,orpolypeptidechains. ○ Introns Theuncodedregionofpre-mRNA. UsuallycutandremovedbeforeRNAleavesthenucleus. (RNASPLICING) ○ Exons ThecodedregionsthatstaywhenthemRNAleavesthenucleus. ○ Codon Atripletof3nucleotidesinDNAorRNAthatcodesforaspecificamino acidorsignalsthestartorendofproteinsynthesis. ○ Anticodon ThecomplementarycodonthatattachestothecodoninthemRNA.The otherendofthetRNAsiteiswhereanAminoAcidcanattach. OnthetRNA,whichisattachedtotheribosomalsite. ○ Cap&Tail ThecapandtailaretoprotectRNAfromenzymesinthecytoplasm,and helpribosomesrecognizeitasmRNA. ○ Polypeptidechain AchainofaminoacidsthatareproducedfromthetranslationofmRNAto aminoacids,withthetRNApumpingouttheaminoacidstoformachain. Alsoknownasprotein. D efinemutationanddescribehowmutationsoccur.Identifywaysthatmutationscan affectgenetranslation. ○ MutationisapermanentchangeintheDNAsequenceofanorganism,occurring whenthereisanerrorduringDNAreplicationduringcelldivision ○ Mutationmayoccurwhenexposedtoenvironmentmutagens. ○ Mutationscanaffectgenetranslationbycausingchangesintheaminoacid sequenceofaprotein,potentiallyleadingtoanon-functionalproteinoraltered proteinactivity,dependingonthespecificmutationtype. Mutationtypes:Deletion,Additionsubstitution ○ Silentmutation(Substitution):Substitutionchangethathaslittletonoeffect. Ex.GAAtoGAGarebothGluaminoacids. ○ Missensemutation(Changed):Whenonenucleotideischangedandhasan effect. GGC(Gly)mutatedtoAGC(Ser) ○ Frameshiftmutation(Deletion/Addition):Whenanucleotideisaddedordeleted, causesashiftintheaminoacidcodingafterthebase. GATTACA*Addmutation*GATTAACA Or,GATTACA *Addmutation*GATTA A Explainhowandwhygenesareregulated: ○ Genesareregulatedbybeingturned“onandoff”.Thisallowsforspecific proteinstobeproducedattherighttimeandtherightamount Reproductivecloning ○ Reproductivecloningistheprocessofcreatingawholeotherorganism. Geneticidenticalcopy ○ Process: Getaneggcellfromananimalandremovethenucleus. TransferthedonorDNAtotheemptyeggcell. Eggisactivatedtostartdevelopingasanembryo. Theembryoisthenimplantedintoasurrogatemothertohelpitdevelop. **Dollythefirstclonedsheep.** Therapeuticcloningofstemcells(embryonicvsadult) ○ Producedembryonicstemcells. ○ Grownincultures. Embryonicstemcellsarefromblastocysts.Growninaculture.Could growcellsforrepairofinjuredordiseasedorgans,spinalcordinjuries,or heartattacks. AcontroversialtopicistheremovalofEScellsthatdestroytheembryo. ○ **Totipotent-Thepossibilitytoturnintoanything,andgainanewfunction.** ○ AdultStemcellscanalsogeneratereplacementsforbodycells. Alsoknownassomaticcells. LessversatilethanEScells,butalsolesscontroversial. Alreadyhadsomeswitchesonandoff. ○ **Pluripotent-Cannowdomanythings,butnotall. DNATechnologyCh12(pp.216-237) .DefineandexplainrecombinantDNAtechnology. 8 RecombinantDNA: - WhenDNAfrom2differentsourcesarecombined,theyarecalledrecombinantDNA. Techniques: - Scientistsusebacterialplasmidstocarryagene,andarekeytogenecloning. - ecombinantDNAareusedinavarietyoftechniques,suchasgenecloningand R thereforethemakingofmanyproteins/moleculessuchasinsulinorHGH. .Determinehowgenesareclonedinbacteria,anddistinguishbetweentheprocessesof 9 transformation,transduction,andconjugation. Howgenesarecloned: - DNAfrom2sourcesjoined,resultinginrecombinantDNAplasmids - Saidplasmidsaremixedwithbacteria - Eachbacteriagoesthroughcelldivisionandformsacloneoftheoriginalgene - Thenthesearegrownintanks. Transduction: - AfragmentofDNAfromanotherbacterialcellisinsertedintothecell. Translation: - AfragmentofDNAentersthecellfromanotherbacterialcell. Conjugation: - DonorgivesDNAtotherecipientcell,andtheirDNAmixes. - 10.Determinethesignificance,uses,androlesofplasmidsandrestrictionenzymesingenetic recombination,usingthefollowingterms: vector DNAsplicing-restrictionenzymestocutDNA,whichthenallowsforanothergenetobe squeezedbetweenasequence. DNAligase-Gluesnucleotidestogetherandactsasafinalcheck. RecombinantDNA-DNAfrom2differentsources. restrictionenzymes-EnzymesthatcutDNAforisolation stickyends-whenaDNAiscut,ithasafewnucleotidesthathavenootherstrand. bluntends-endsofasequencethatdonothaveexcessends. cloningofbacteria-whentwodifferentDNAarecut,thentheyareseparatelyrecombined.Then theyaremixedwithbacteria,whicharethengrownintanksduetocelldivision. 1.Perform/usePolymeraseChainReaction(PCR)technologytoproducemultiplecopiesofa 1 desiredgene,toinvestigateascientificproblem. PCR: - DNAsampleismixedwithnucleotides,DNApolymerase,primers,andotherstuff. - Thesolutionisheated(separatesDNA)andcooled(reformsDNA) - ResultsintheDNAgrowingreallyfast. Primers: Chemicallymade1-strandDNAthattargetsdesiredsequence. Genecloning-theduplicationofagene: - DNAfrom2sourcesjoinedresultsinrecombinantDNAplasmids. - RecombinantDNAmixedwithbacteria - Eachbacteriadoescelldivisiontomakeaclonewiththerecombinantplasmid - Thetransgenicbacteriawiththegeneofinterestisthengrownintanks. Thegenecouldalsobeusedinotherexperiments. robe: P Aprobeisashort,single-strandedDNAorRNAsequencethatisusedtodetectthe presenceofacomplementarynucleotidesequenceinasample.Probesareoftenlabeled withradioactive,fluorescent,orenzymaticmarkerstoallowvisualization. 2.Performthetechnologyofusinggelelectrophoresistosolveacrimeorpaternitycase. 1 DeterminehowgelelectrophoresisisusedtoseparateDNA,howelectrophoresisworks,and howcurrentapplicationsofDNAfingerprintingandprofilingtechnologyareused,withthe followingterms: PreparingtheGelBed - Closeofftheopenendsofagelbedbyusingmaskingtape-extendthetapeoverthe sidesandbottomedgeofthebed. - Foldtheextendededgesofthetapebackontothesidesandbottom. Placethebluecombinthenotchesclosesttotheendofthetray CastingtheGel 1. Dispensecooledagarosesolutionintothebed.Makesurethebedisonalevelsurface anditisnotdisturbedoncethesolutionispoured. 2. Allowthegeltocompletelysolidify. PreparingtheSolidifiedGelforElectrophoresis 1. Slowlyremovethetape.Becarefulnottodamageorteargelwhenremovingtape. 2. Removethecombbyslowlypullingitstraightup. 3. Orientthegeltrayintotheapparatussothatthesamplewellsareclosesttothenegative (black)electrode. 4. Fillthechamberoftheelectrophoresisapparatuswithadilutedbuffer.Thesolidifiedgel shouldbecompletelysubmergedunderthebuffer. GelLoading Youwillbeusinga"Quickstrip"samplethatcontainsthe5samplesneededforthisexperiment. 1. Ineachofthewellsofthegel,useamicropipettetoloadsamplesintothewells. RunningtheGel 1. AftertheDNAsamplesareloaded,carefullysnapdownthechambercoverontothe electrodeterminals. - Makesurethatthenegative(black)andpositive(red)indicatorsonthecoverandthe apparatuschamberareproperlyoriented. 2. Inputthepowersources. 3. Setthepowersourceat125voltsandletthegelrun.Whencurrentisflowingproperly, youshouldseebubblesformingontheelectrodes.Runtheelectrophoresisfor25 minutes. 4. Aftertheelectrophoresisiscompleted,turnoffthepower,unplugthepowersource,and removethecover. 5. Removethegelonitsbedfromtheapparatus. StainingandVisualizingtheGel - Thegelmustbeexposedtoastainingsolution,INSTASTAIN,thatbindstotheDNA fragmentsinthegel.Thestainedgelisthenexposedtolight(alightbox)andthe separatedDNAfragmentsareseenasvisiblebands. - hesearethebandsyoumayhaveseeninexamplesofDNAfingerprinting.Eachband T isapieceofDNAofadifferentsizethatwasoriginallycutwithrestrictionenzymes.After staining,thegelcanbephotographedforapermanent StainingwithDNABlueInstaStainCard: 1.Afterelectrophoresisiscompleted,slidethegelintothegel-stainingtray. 2.Moistenthegelwithanelectrophoresisbuffer,withapipet. 3.Wearinggloves,placethebluedyesideoftheDNABlueInstaStaincardonthemoistened gel. 4.FirmlyrunyourglovedfingersovertheentiresurfaceoftheDNAInstaStaincardseveral times NAfragmentsize-FragmentsofDNAdisplayedinagelelectrophoresisbed,thesizeof D whichcanbetoldbasedonhowclosethebandistothepositivecharge. Restrictionfragments- DNAthathasbeencutbyarestrictionenzyme. Agarosegel-thegelatin-likesubstancethatmakesupthebedofangelelectrophoresisbed. DNAbands-ThebandsofDNAthatdisplaytheDNAprofileofabed,andcanbeusedto compareDNA. DNAbandmigrationfromnegativetopositive- ThemigrationofDNAfromthenegativewell tothepositivewell.ThisisduetothenegativechargedphosphatetheDNA’ssugar-phosphate backbonehas,andcausesthesmallerpiecestomoveclosertothepositivecharge. Forensics-AfieldinwhichDNAtestinghasdramaticallychangedtoconfirmthingssuchas criminalorpaternitycases,trackingofendangeredanimals,ect. Paternity-AnotherfieldthathaschangedduetoDNAprofilingbecauseitusesDNAtotrack whotheparentsare,andthereforesolvewhoafatheris. GeneticScreening-Thescreeningofone’sDNAtogointoadatabase. 3.DescribethegoalsoftheHumanGenomeProjectandexplainthesignificanceinthe 1 sequencingofthegenomesofotherorganisms Theprojectaimedto: - sequencetheentirehumangenome, - identifyandmapallhumangenes - improvetoolsforanalyzingDNA SIgnificancetootherspecies: - Understandevolutionaryrelationshipsandgeneticsimilaritiesbetweenspecies. 4.Beabletoperformandinterpretthefollowinggenetechnologiesusingdata,activities,or 1 DNAfingerprinting,restrictionenzymeanalysis,transgenicorganisms,cloning,PCR 15.ExplainthefollowingapplicationsofDNAtechnology,endtheethicalconcernsofeach Tech Pro Con iotechFarming/genetically B Couldsolvehungerand ouldalsobeunhealthyand C engineeredcrops. tarvationissuesfortheworld unsafeforconsumption.Can s lsolowergeneticdiversity a keyforevolutionandnatural selection.Couldalsomake superweedsifextremely resistantplantspollinateand spreadtraitstoweeds. eneticallyengineered G ouldproveanexcellentfood C C ouldalsobeunhealthyand animals source haveworseethicalconsdue toexperimentationonliving animals.Canalsolower geneticdiversitykeyfor evolutionandnatural selection. roductionofinsulin,growth p ouldsavelivesandhelp C ouldfailandinjure,canbe C hormone,vaccines withqualityoflife. monopolizedandoverpriced, couldbemisusedbypeople andparents-whogetsto decide?Thefetus? CRISPR ouldsavelivesanddetect c nethicallyalterembryosand u earlyillnessforpreparation lowergeneticdiversity,and CRIPR Technology Biol… couldallowparentstochose Itssoofficiallooking theirchildwhichwouldbe immoral.