What is the role of actin during cell division?

During cell division, actin plays a crucial role, particularly in the process of cytokinesis, which is the final stage of cell division where the cytoplasm of a parental cell is divided into two daughter cells. Specifically, actin filaments contribute to the formation of a contractile ring, which is essential for the physical separation of the two daughter cells.

As the cell prepares to divide, the actin filaments form a dense network beneath the plasma membrane at the center of the cell. During cytokinesis, myosin motor proteins interact with these actin filaments to contract the ring, which pinches the cell membrane and results in the formation of two distinct daughter cells. This contractile mechanism is vital for ensuring that the division is successful and that the two new cells are properly separated.

The other options presented do not accurately reflect the primary functions of actin in cell division. Actin does not assist in DNA replication processes, stabilize microtubules, or directly activate growth factors. Instead, its key function in forming the contractile ring is critical for successful cytokinesis.