Final answer:
Before the cell can exit mitosis, all the cyclin proteins must be degraded, inactivating the CDKs. This destruction is crucial for the transition from the mitotic phase to the completion of cell division and is a key part of the cell cycle regulation.
Step-by-step explanation:
Before the cell can exit mitosis, all the cyclin proteins have to be destroyed, leaving the CDKs (cyclin-dependent kinases) inactive. The destruction of cyclin proteins ensures that the cell cycle can transition from the mitotic phase to the end of the cell division process. The cell cycle includes several distinct phases, such as the G₂ Phase, where the cell prepares for mitosis by energy replenishment and protein synthesis necessary for chromosome manipulation, and the mitotic phase, where chromosomes are aligned, separated, and moved to opposite poles, followed by cytokinesis resulting in two identical daughter cells.
Cytokinesis marks the end of the mitotic phase where in animal cells, an actin ring separates the daughter cells and in plant cells, a cell plate develops into a new cell wall. The careful regulation of cyclin and CDK activity allows cells to proceed through the stages of the cell cycle, ensuring the formation of genetically identical daughter cells after cell division is complete.