Describe the formation of the cell plate. Regulation of the Cell Cycle Remember the timing and rate of cell division is not the same for different cell types. This is important for normal growth, development, and maintenance in plants and animals. Give examples of cells that have different rates and timing of cell division. Signals at certain checkpoints report whether crucial cellular processes up to that point have been completed correctly.
Checkpoints also register signals from outside the cell.
It is the rhythmic fluctuations in the abundance and activity of cell-cycle control molecules that pace the events of the cell cycle. To be active , these kinases must be attached to a cyclin. Describe the action of the MPF cyclin-Cdk complex. Though very little is known about the signaling pathways that link cyclin-dependent kinases to other molecules, some steps of signaling pathways have been identified. Describe the role of kinetochores as internal signals.