AP BIOLOGY

Detailed explanation-1: -The last stage of the cell cycle is cytokinesis, or the division of the cytoplasm. In animal cells the cell membrane pinches in half. In plant cells, a new cell wall begins to grow in an area called the cell plate located between the two new nuclei until they are separated into two new cells.

Detailed explanation-2: -In animal cells, the area of the cell membrane that pinches inward to separate the dividing cell into two cells is called the cleavage furrow.

Detailed explanation-3: -In animals, cell division occurs when a band of cytoskeletal fibers called the contractile ring contracts inward and pinches the cell in two, a process called contractile cytokinesis. The indentation produced as the ring contracts inward is called the cleavage furrow.

Detailed explanation-4: -Cell division ends as the cytoplasm divides into two by the process of cytokinesis. Except for plants, cytokinesis in eucaryotic cells is mediated by a contractile ring, which is composed of actin and myosin filaments and a variety of other proteins.

Detailed explanation-5: -At the cytokinesis furrow, it is the actin-myosin contractile ring that drives the cleavage process, during which cell membrane and wall grow inward, which eventually pinches the mother cell in two.