Transcription De L'adn En Arn Pdf Free > urlin.us/4gcv3

6704223018
Duplication,,semi-conservatrice,,de,,lADN.,,On,,parle,,,,dhlice,,droite,,.,,WEHI-TV,,,des,,,animations,,,assez,,,exactes,,,scientifiquement,,,,mme,,,si,,,les,,,molcules,,,sont,,,reprsentes,,,comme,,,flottant,,,dans,,,un,,,liquide,,,,ce,,,qui,,,est,,,tout,,,,,,fait,,,faux,,,(la,,,cellule,,,est,,,trs,,,encombre,,,et,,,il,,,n'y,,,a,,,pas,,,d'eau,,,libre),,,PAGE,,,AVEC,,,VERSIONS,,,FRANAISES,,,des,,,vidos,,,Lors,,,de,,,la,,,transcription,,,,la,,,molcule,,,d'ADN,,,est,,,maintenue,,,ouverte,,,(brins,,,spars),,,par,,,un,,,gros,,,complexe,,,enzymatique,,,:,,,l'ARN,,,polymrase,,,(ARN,,,polymrase,,,ADN,,,dpendante,,,qui,,,contient,,,du,,,Zn2+),,,dans,,,une,,,zone,,,d'une,,,longueur,,,de,,,17,,,paires,,,de,,,bases,,,(3,4,,,nm,,,pour,,,10,,,pb),,,ce,,,qui,,,ncessite,,,,du,,,fait,,,de,,,l'enroulement,,,de,,,l'ADN,,,,de,,,drouler,,,l'ADN,,,en,,,amont,,,et,,,de,,,le,,,renrouler,,,en,,,aval,,,de,,,la,,,zone,,,de,,,transcription.,,,Il,existe,des,signaux,darrt,,les,signaux,de,,terminaison,.,Un,,,polysome,,,se,,,prsente,,,au,,,MET,,,comme,,,une,,,chane,,,(parfois,,,fixs,,,au,,,MET,,,sous,,,la,,,forme,,,d'une,,,spirale),,,de,,,ribosomes,,,le,,,long,,,d'une,,,molcule,,,d'ARNm,,,qu'ils,,,traduisent.,,,On,,,parle,,,notamment,,,dARNmessager,,,qui,,,sera,,,alors,,,traduit,,,en,,,protines.,,,Cest,une,ARNpolymrase,qui,synthtise,cette,amorce,5,->,3.,Le,,Lactose,,empche,,la,,rpression,,=,,production,,d,,enzymes,,pour,,le,,lactose.,,Au,,sens,,large,,,le,,gnome,,comprend,,l'ensemble,,du,,matriel,,gntique,,(ADN,,,ARN,,et,,mme,,protines),,d'un,,organisme.,,(ADN)n,,+,,dsoxyribonuclotides,,triphosphates,,->,,(ADN)n+1,,+,,diPhosphate,,Les,,liaisons,,phosphates,,apportent,,lnergie,,ncessaire.,,

Les,ribosomes,font,partie,des,ribozymes,(=,ARN,ayant,des,proprits,enzymatiques);,la,grande,sous-unit,,dbarasse,de,la,plupart,de,ses,protines,est,encore,capable,de,catalyser,la,formation,de,liaisons,peptidiques.,Le,,code,,gntique,,est,,universel,,parce,,que,,tous,,les,,systmes,,de,,traduction,,cellulaire,,utilisent,,les,,mmes,,correspondances,,codon-aa.,,-,,Les,,ARNm,,sont,,lus,,dans,,le,,sens,,5'->3'.,,Il,y,a,alors,une,addition,dune,squence,de,plusieurs,Adnine,(=,,polyA,),au,niveau,du,transcrit,qui,vient,de,se,dtacher.,Plusieurs,,,exemples,,,sont,,,connus.,,,,,3.2.2,,-,,La,,traduction,,suit,,un,,dictionnaire,,:,,le,,code,,gntique,,Chaque,,triplet,,de,,bases,,de,,l'ARNm,,(codon),,est,,associ,,,,un,,aa,,activ,,grce,,,,son,,ARNt,,spcifique.,,Il,y,a,donc,4,x,4,x,4,=,64,possibilits,de,codons,diffrents.,Ainsi,,on,,tablit,,un,,sens,,de,,lADN,,:,,5,,->,,3.,,De,,plus,,,les,,coiffes,,et,,les,,queues,,ventuelles,,des,,ARNm,,n'ont,,pas,,t,,reprsentes.,,La,,,peptidyltransfrase,,,est,,,une,,,activit,,,contenue,,,dans,,,le,,,ribosome,,,et,,,qui,,,vatransfrer,,,la,,,Met,,,sur,,,l'AA,,,suivant.,,,

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