题目内容

动物细胞有丝分裂前期不具有的特征是()。

A. DNA复制
B. 染色体形成
C. 核膜消失
D. 核仁消失
E. 中心粒出现星射线

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G1期细胞有几种不同的去向?

阐述细胞增殖周期各时相的变化。

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A. Mainly rice and vegetables.
B. Mainly rice and meat.
C. Occasionally rice and vegetables.
D. Occasionally meat and vegetables.

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A. He has never been ill till now.
B. He hasn"t had any injuries.
C. He has some health problems now.
D. He stopped growing because of disease.

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