During which phase of mitosis does the nuclear membrane dissolve?

• A. Prophase
• B. Metaphase
• C. Anaphase
• D. Telophase

Answer: (A)

Verified step by step guidance

1. Understand the question: The problem is asking during which phase of mitosis the nuclear membrane dissolves. Mitosis is the process of cell division that ensures equal distribution of chromosomes into two daughter cells.
2. Recall the phases of mitosis: Mitosis consists of four main phases: Prophase, Metaphase, Anaphase, and Telophase. Each phase has distinct events that occur in the cell.
3. Focus on Prophase: During Prophase, the chromatin condenses into visible chromosomes, the spindle fibers begin to form, and the nuclear membrane starts to break down. This is the phase where the nuclear membrane dissolves.
4. Review the other phases: In Metaphase, chromosomes align at the cell's equatorial plate. In Anaphase, sister chromatids are pulled apart to opposite poles. In Telophase, the nuclear membrane reforms around the separated chromosomes.
5. Conclude: Based on the events described, the nuclear membrane dissolves during Prophase. This is the correct answer to the question.