la réplication de l'adn


Qu'est-ce que la réplication de l'ADN ?

La réplication de l’ADN est le processus par lequel une cellule en division génère une copie de son ADN.

Comment la réplication de l’ADN a-t-elle lieu ?

Dans cette fiche explicative, nous allons apprendre comment la réplication de l’ADN a lieu ainsi que le rôle joué par chacune des enzymes impliquées. La double hélice est une structure en forme d’«?échelle torsadée?», c’est la forme propre aux molécules d’ADN.

Comment l’ADN se réplique-t-il ?

Quand une cellule subit une division, son ADN se réplique, de manière à fournir à chaque nouvelle cellule une copie d’ADN qui peut contrôler les caractéristiques et les fonctions de la cellule. Nous savons qu’une seule molécule d’ADN est composée de deux brins polynucléotidiques complémentaires.

Quel est le rôle de la polymérase dans la réplication de l’ADN ?

Cette enzyme joue un rôle essentiel dans la réplication de l’ADN. L’ADN polymérase génère un nouveau brin d’ADN le long de chaque brin original en ajoutant des nucléotides au nouveau brin, en veillant à ce que les règles d’appariement complémentaire des bases, que nous avons vues précédemment, soient respectées.

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