Destruction of both centrosomes with a laser beam in an animal cell:

1. will prevent both mitosis and cytokinesis

2. prevents cytokinesis even if mitosis has been completed normally

3. permits cytokinesis but the daughter cells fail to enter a new S phase

4. prevents mitosis but permits cytokinesis

Anaphase is characterized by two distinct motions. The second motion, anaphase B:
1. moves chromosomes to either pole of a dividing cell and this movement is primarily generated by the action of kinetochore microtubules.

2. moves chromosomes to either pole of a dividing cell and this movement is primarily generated by the action of interpolar microtubules.

3. involves the separation of the two poles from each other and the movement for this is primarily generated by the action of kinetochore microtubules.

4. involves the separation of the two poles from each other and the movement for this is primarily generated by the action of interpolar microtubules.