Discuss in detail in a paragraph or two Cell cycle control s

Discuss in detail in a paragraph or two:

Cell cycle control system mechanisms, including a discussion of the role of the MPF complex and of PDGF

Solution

Cell cycle control system mechanisms are:

There are checkpoints in the cell cycle like the G1, G2 and the M phase and hence the transitions in the cell cycle are regulated by the activities of various protein kinase complexes composed of cyclin and cyclin-dependent kinase (Cdk) molecules. For e.g. the MPF a complex of cyclin and cyclin-dependent kinase (Cdk) drives the cell past the G2 check point and the external signal like PDGF stimulates the cell to divide.