Question

multiple-choice question during which phase does the nuclear envelope dissappear? interphase prophase metaphase

Explanation:

To determine when the nuclear envelope disappears, we analyze each phase:

• Interphase: The cell is preparing for division; the nuclear envelope remains intact as the cell grows, replicates DNA, etc.
• Prophase: This is the first stage of mitosis (or meiosis). During prophase, the chromatin condenses into chromosomes, the spindle apparatus begins to form, and the nuclear envelope breaks down (disappears) to allow the spindle fibers to interact with the chromosomes.
• Metaphase: In this phase, chromosomes align at the cell's equatorial plate (metaphase plate). The nuclear envelope has already disappeared in prophase, so it is not the phase where the nuclear envelope disappears.

Answer:

B. Prophase