Multiple Choice
During which stage of mitosis do chromosomes line up along the middle of the cell (the metaphase plate)?
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16. Cell Division
Mitosis
Multiple Choice
During prophase of mitosis in an animal cell, what happens to the nucleus?
A
The nuclear envelope stays intact and chromosomes align at the cell equator.
B
The nuclear envelope begins to break down as chromatin condenses into visible chromosomes.
C
Sister chromatids separate and move toward opposite poles while the nuclear envelope remains intact.
D
A new nuclear envelope forms around each set of chromosomes, producing two nuclei.
Verified step by step guidance1
Understand the stages of mitosis, focusing on prophase, which is the first stage of mitosis after interphase.
Recall that during prophase, chromatin (the uncondensed form of DNA) begins to condense into visible chromosomes, making them easier to separate later.
Recognize that the nuclear envelope, which encloses the nucleus, starts to break down during prophase to allow the mitotic spindle to interact with the chromosomes.
Note that the nuclear envelope does not stay intact during prophase; it breaks down progressively, which is essential for chromosome movement.
Remember that sister chromatids separate and move toward opposite poles during a later stage called anaphase, and a new nuclear envelope forms during telophase, not prophase.
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