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ARN de trasnfert (ARNt): Ils servent à « traduire » les codons de l'ARNm en acides aminés. Ce sont des molécules qui se placent sur les sites du ribosome où va être lu l'ARN messager.
ARN messager (ARNm): Son rôle consiste à transporter l'information génétique recueillie du noyau vers le cytoplasme où elle sera traduite en protéine par les ribosomes du réticulum endoplasmique.
Ribosome: Son rôle est de déchiffrer le code de l'ARN messager pour synthétiser les protéines.
Queu polyA: Partie ajouté à l'extrémité 3' de l'ARNm durant la Polyadénylation. Ceci intervient en particulier dans la protection contre la dégradation, le transport et dans le recrutment du ribosome.
Coiffe 5': La coiffe bloque en particulier l'action des exonucléases 5' → 3' et augmente la durée de vie des ARN messagers // La traduction d'un ARNm cellulaire est dépendante de la présence d'une coiffe en 5'.
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