Final answer:
Animal cells contain centrioles and the centrosome complex, which are involved in spindle fiber formation during mitosis, whereas plant cells utilize a microtubule organizing center (MTOC) without centrioles.
Step-by-step explanation:
Animal cells have structures called centrioles and a centrosome complex, not found in plant cells. These structures are involved in animal cell mitosis but not in plant cell mitosis.
In animal cell mitosis, centrioles help in the formation of the spindle fibers that segregate chromosomes during cell division. Each centrosome, located near the nucleus, contains a pair of centrioles, which are at right angles to each other and play a crucial role in the organization and movement of chromosomes.
On the other hand, plant cells organize their spindle fibers using a different structure, the microtubule organizing center (MTOC), which does not contain centrioles. Moreover, animal cells may also use structures such as lysosomes during the cell cycle, which are typically not found in plant cells.