本题目来源于试卷: Continuity and Change D.4 Cell & Nuclear Division，类别为 IB生物学
[单选题]
During which stage of v97tym. 62es2 muuog.r 5f8yeciw)ksmitt/+xv5o w5lb q8q7v pfosis does the nuclear envelope break down?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
参考答案: A
本题详细解析:
The nuclear envelope is the membrane that separates the nucleus from the cytoplasm. For mitosis to proceed it must be broken down in the first stage of mitosis which is prophase so that the spindle fibres are able to attach to the centromeres. Choice A is correct. Metaphase (Choice B), Anaphase (Choice C) and Telophase (Choice D) all follow Prophase (Choice A) in the sequence of mitosis and do not involve the breakdown of the nuclear envelope.
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