下面是蚕豆根尖分生区细胞细胞周期的有关数据。下列叙述正确的是

下面是蚕豆根尖分生区细胞细胞周期的有关数据。下列叙述正确的是（）

A.核糖体、线粒体、叶绿体在2h～19.3h活动旺盛

B.蚕豆根尖细胞分裂的一个细胞周期为19.3h

C.0～2h期间，DNA分子处于解旋状态

D.分生区细胞核膜，核仁解体可发生在可发生在21.3h～38.6h

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下面是蚕豆根尖分生区细胞细胞周期的有关数据。下列叙述正确的是

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