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Multiple Choice
Which of the following events occur during prophase of mitosis?
A
Sister chromatids are pulled apart.
B
Chromosomes condense and become visible.
C
The nuclear envelope re-forms around chromosomes.
D
Chromosomes align at the cell's equator.
Verified step by step guidance
1
Understand the stages of mitosis: Mitosis is divided into several phases: prophase, metaphase, anaphase, and telophase. Each phase has distinct events that occur.
Focus on prophase: During prophase, the chromatin condenses into visible chromosomes. This is a key event that distinguishes prophase from other stages.
Identify the events specific to prophase: In prophase, the chromosomes condense and become visible under a microscope. The nuclear envelope begins to break down, but it does not re-form until telophase.
Differentiate from other phases: Sister chromatids are pulled apart during anaphase, not prophase. Chromosomes align at the cell's equator during metaphase, not prophase.
Conclude with the correct event: The correct event that occurs during prophase is the condensation of chromosomes, making them visible.