Why does the nuclear envelope break down during prometaphase?

The correct sequence for the phases of mitosis is:

The phase of mitosis where chromosomes condense and centrosomes move to opposite poles of the cell is:

The mitotic spindle plays a critical role in which of the following processes of cellular division?

Which of the following events characterizes metaphase of mitosis?

I. Movement of chromosomes to the equatorial plane (metaphase plate) of the cell.

II. A spindle fiber attaches to each sister chromatid.

III. Separation of sister chromatids that are being pulled to the poles of the cell.

Metaphase is characterized by ________.

In what way do kinetochore microtubules facilitate the process of splitting the sister chromatids?