Question

exam lesson name: the cell and its processes
exam number: 700942rr
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question 16 of 20 :
select the best answer for the question.

1. in mitosis, when does the nuclear envelope break down?

○ a. metaphase
○ b. telophase
○ c. prophase
○ d. anaphase
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Explanation:

To solve this, we recall the stages of mitosis:

• Prophase: Chromosomes condense, the mitotic spindle forms, and the nuclear envelope breaks down.
• Metaphase: Chromosomes align at the equator.
• Anaphase: Sister chromatids separate.
• Telophase: Nuclear envelopes reform, and cytokinesis starts.

So the nuclear envelope breaks down in Prophase.

Answer:

C. Prophase