Question

multiple choice question
during which phase of the cell cycle does the nuclear envelope breakdown and the centrosomes move towards the ends of the cell?

telophase
prophase
metaphase
anaphase

Explanation:

To solve this, we analyze each phase:

• Telophase: Nuclear envelope reforms, chromosomes decondense. Eliminate.
• Prophase: Chromosomes condense, nuclear envelope breaks down, centrosomes (with spindle fibers) move to opposite poles (ends of cell). This matches.
• Metaphase: Chromosomes align at equator. Eliminate.
• Anaphase: Sister chromatids separate and move to poles. Eliminate.

Answer:

B. Prophase