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Multiple Choice
During metaphase, ________.
A
chromosomes align at the cell's equatorial plate
B
DNA replication occurs
C
sister chromatids are pulled apart to opposite poles
D
the nuclear envelope reforms around chromosomes
Verified step by step guidance
1
Understand the context of the cell cycle: Metaphase is a stage in mitosis, which is the process of cell division. Mitosis consists of several phases: prophase, metaphase, anaphase, and telophase.
Recall the key events of metaphase: During metaphase, chromosomes are fully condensed and align at the cell's equatorial plate (also called the metaphase plate). This alignment ensures that each daughter cell will receive an identical set of chromosomes.
Eliminate incorrect options: DNA replication occurs during the S phase of interphase, not during metaphase. Sister chromatids are pulled apart during anaphase, not metaphase. The nuclear envelope reforms during telophase, not metaphase.
Focus on the correct option: The defining characteristic of metaphase is the alignment of chromosomes at the equatorial plate, facilitated by the spindle fibers attaching to the centromeres of the chromosomes.
Summarize the concept: Metaphase ensures proper chromosome alignment and prepares the cell for the subsequent separation of sister chromatids during anaphase.