Final answer:
When parent DNA is damaged or a cell is not fully grown, the concentration of Cdk inhibitor proteins will increase to prevent the cell cycle from advancing; this ensures that damage is not propagated and that cells grow adequately before division.
Step-by-step explanation:
If the parent DNA is damaged or the cell hasn't grown enough, the concentration of Cdk inhibitor proteins will increase in concentration. These proteins function to halt the cell cycle to prevent the propagation of damage or to ensure adequate cell growth before division.
Cyclin-dependent kinases (Cdks) and cyclins are critical in regulating this process. When there is DNA damage or insufficient growth, the cell cycle is arrested through the action of Cdk inhibitors which inhibit the formation or activity of Cdk/cyclin complexes necessary for the cell to proceed to the next phase. This is a protective mechanism to maintain cellular integrity and prevent the multiplication of errors.