Question

during which phase of mitosis in animal cells do centrioles begin to move apart?

prometaphase

metaphase

anaphase

prophase

telophase

Explanation:

In animal cell mitosis, during prophase, the centrosomes (which contain centrioles) start to move apart. The centrosomes are the microtubule - organizing centers. As they move apart, they begin to form the mitotic spindle. In prometaphase, the nuclear envelope breaks down, and spindle microtubules attach to kinetochores. In metaphase, chromosomes align at the metaphase plate. In anaphase, sister chromatids separate. In telophase, the nuclear envelope reforms.

Answer:

prophase