During which phase of the cell cycle can MAPK become active?

MAPK, or Mitogen-Activated Protein Kinase, is involved in transmitting signals from the cell surface to the nucleus, particularly in response to growth factors and hormones. The activation of MAPK occurs primarily during the M phase of the cell cycle, which is when the cell is undergoing mitosis.

During the M phase, various signaling pathways are activated to facilitate cell division. MAPK plays a crucial role in this process by regulating events such as cell growth, differentiation, and survival during mitosis. The activation of MAPK at this stage helps to ensure that the cell is ready to divide and can respond to the necessary cellular cues that trigger mitosis.

While MAPK can be involved in other phases to some extent, its critical role and notable activation occur in M phase, directly influencing the progression and successful completion of cell division.