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Quelles sont les 3 propositions exactes ?A. Lors du cycle cellulaire, on observe une variation de la quantité d'ADN dans la cellule : la cellule en phase GI a une quantité d'ADN de 2n, lors de la phase S la quantité d'ADN varie de 2n à 4n, en phase G2 la quantité d'ADN est de 4n et lors de la mitose la quantité d'ADN passe de 4n à 2n.B. En phase S, on observe un arrêt progressif de la synthèse des protéines, à l'exception de la synthèse des histones et des enzymes de l'anabolisme de la thymidine triphosphate.C. Le traitement d'une culture cellulaire par la colchicine conduit au blocage de l'ensemble des cellules en anaphase de mitose.D. Deux hypothèses sont avancées pour expliquer l'entrée en sénescence d'une cellule : le raccourcissement des télomères et l'accumulation du facteur P27/kip1 lors des divisions cellulaires successives.E. Autre réponse

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