fill in the appropriate term for the following statements about regulation of the cell cycle. the activity of a cyclin-dependent kinase depends on interaction with a cyclin. just before mitosis, a mitotic cyclin interacts with an appropriate cdk to start m phase. after a cell enters s phase, the g1 checkpoint will be degraded. cyclins are named because their levels (click to select) during gap, s and m phases. the point in the cell cycle at which conditions are assessed before continuing is called a checkpoint .