réplication semi conservative definition


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  • L'ADN polymérase est une enzyme catalysant la formation des liaisons nucléotidiques.
    Le complexe enzymatique intervenant dans la réplication est appelé réplicase.
    La réplication peut être divisée en trois étapes principales : l'initiation, l'élongation et la terminaison.

  • Qui a découvert la réplication semi-conservative ?

    La découverte de la réplication semi-conservative de l'ADN est attribuée à Matthew Meselson et Franklin Stahl en 1958.

  • Pourquoi on dit que la réplication est semi-conservative ?

    La réplication semi-conservative est le mécanisme de duplication (reproduction à l'identique) de l'ADN, avant une division cellulaire.
    Elle est semi-conservative : la molécule d'ADN néoformée contient un brin ancien et un brin nouveau.
    Les deux chromatides d'un même chromosome sont parfaitement identiques.

  • La réplication semi-conservatrice décrit le mécanisme de réplication de l'ADN dans toutes les cellules connues. La réplication de l'ADN se produit sur plusieurs origines de réplication le long des brins matrices d'ADN. Wikipédia (anglais)Autres questions
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    Why is replication called semiconservative?

    • Why is it called Semiconservative replication? Semiconservative replication acquires its name from the truth that this system of transcription was just one of 3 designs initially recommended for DNA replication: Semiconservative replication would certainly generate 2 duplicates that each had among the initial hairs of DNA as well as one brand-new hair.

    Why is DNA replication called semi conservative?

    • The reason that DNA replication is considered a semi-conservative process is because the "new" strand that is produced is not 100% new.
      . Half of the replicated strand contains the original

    What is meant by semiconservative replication?

    • Semiconservative replication means that during DNA replication, each strand of DNA from the original cell is "conserved", or not changed, while a complementary copy is made from "new" nucleotides.
      . The Meselson-Stahl experiment led to the discovery that DNA is replicated semiconservatively.

    Why is DNA replication considered semiconservative?

    • DNA replication occurs on multiple origins of replication along the DNA template strand.
      . As the DNA double helix is unwound by helicase, replication occurs separately on each template strand in antiparallel directions.
      . This process is known as semi-conservative replication because two copies of the original DNA molecule are produced.










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