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Multiple Choice
During metaphase of mitosis, which event occurs?
A
Sister chromatids separate and move toward opposite poles of the cell.
B
The nuclear envelope reforms around each set of chromosomes and chromosomes begin to decondense.
C
DNA is replicated to produce identical sister chromatids for each chromosome.
D
Sister chromatids align at the cell's equator (metaphase plate) with kinetochores attached to spindle microtubules from opposite poles.
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Verified step by step guidance
1
Understand the phases of mitosis and the key events that characterize each phase: prophase, metaphase, anaphase, and telophase.
Recall that during metaphase, chromosomes are highly condensed and align at the cell's equatorial plane, known as the metaphase plate.
Recognize that sister chromatids are attached to spindle microtubules via kinetochores, with microtubules extending from opposite spindle poles.
Note that the separation of sister chromatids occurs in anaphase, not metaphase, and that nuclear envelope reformation and chromosome decondensation happen during telophase.
Conclude that the defining event of metaphase is the alignment of sister chromatids at the metaphase plate with proper attachment to spindle fibers, ensuring accurate chromosome segregation.