Multiple Choice
During which phase of the cell cycle are chromosomes aligned in a single line at the cell's equatorial plane?
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3. Energy & Cell Processes
Phases of Mitosis
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During which phase of mitosis does the nuclear envelope break down?
A
Metaphase
B
Prophase
C
Telophase
D
Anaphase
Verified step by step guidance1
Understand the stages of mitosis: Mitosis is divided into several phases: prophase, metaphase, anaphase, and telophase.
Identify the key events in each phase: In prophase, the chromatin condenses into visible chromosomes, and the mitotic spindle begins to form.
Focus on the nuclear envelope: During prophase, the nuclear envelope breaks down, allowing the spindle fibers to interact with the chromosomes.
Differentiate between phases: In metaphase, chromosomes align at the cell's equatorial plate. In anaphase, sister chromatids separate. In telophase, the nuclear envelope re-forms around the separated chromosomes.
Conclude with the correct phase: Since the nuclear envelope breaks down during prophase, this is the phase you are looking for in the context of the question.
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