What ways is the cell cycle controlled in an organism? what happens if the cell cycle is not controlled?

Through phosphorylation, Cdks signal the cell that it is ready to pass into the next stage of the cell cycle. As their name suggests, Cyclin-Dependent Protein Kinases are dependent on cyclins, another class of regulatory proteins. Cyclins bind to Cdks, activating the Cdks to phosphorylate other molecules.

a symbiotic relationship with the mitochondria