Once a cell enters mitosis, the molecules that activate division must be turned off. what happens to mpf during mitosis? it is completely degraded. it is phosphorylated by a cdk, which inactivates it. the cyclin component of mpf is degraded. the cdk component of mpf is degraded.

Option C, the cyclin component of mpf is degraded.

Explanation:

MPF stands for Maturation promoting factor which is a protein complex that makes a cell realize its crucial time of division and formation of new cells.  

It acts as a check point and regulates the progression of cell division from G2 stage to M stage and also check whether the cell has grown effectively by G2 stage.  

MPF is made up of Cdk (Cyklin dependent kinase) protein and cyclin. The level of Cdk and cyclin reduces as the cell division progress.  

 hence, option C is correct