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Multiple Choice
Which of the following does NOT occur during prophase of mitosis?
A
Chromosomes condense and become visible
B
The nuclear envelope breaks down
C
Sister chromatids separate at the centromere
D
The mitotic spindle begins to form
Verified step by step guidance
1
Understand the context of prophase in mitosis: Prophase is the first stage of mitosis where several key events occur to prepare the cell for division.
Review the events that occur during prophase: Chromosomes condense and become visible, the nuclear envelope breaks down, and the mitotic spindle begins to form.
Clarify the event that does NOT occur during prophase: Sister chromatids separating at the centromere is an event that occurs during anaphase, not prophase.
Compare the listed events to the stages of mitosis: Ensure you understand the sequence of mitotic events and identify which stage corresponds to each event.
Conclude that the correct answer is the event that occurs during anaphase, not prophase, based on the biological process of mitosis.