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Proposition(s) correcte(s)ACELes modifications nucléaires morphologiques accompagnent des modifications biochimiques.L'élongation nucléaire s'accompagne de la mise en place d'un structure transitoire micro tubulaire : La manchette. Elle se place de part et d'autre du noyau et disparaitra en fin de spermiogénèse.En parallèle de cette élongation, il y a une réduction du volume nucléaire par la compaction de la chromatine et due à l'apparition de replis sur l'enveloppe nucléaire. La compaction commence à la partie postérieure du noyau. Les modifications biochimiques concernent les nucléoprotéines basiques qui sont des histories somatiques. Ils seront remplacés au cours de la spermiogénèse par des protéines nucléobasiques de transition riches en Arg,Lys, His et Cys. Elles seront remplacées par les protamines, protéines encore plus basiques riches en Arg et Cys. La déphosphorylation des protami

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