Final answer:
Malignant cells do not experience loss of contact inhibition unlike cultured normal cells.
Step-by-step explanation:
Under the same conditions that lead cultured normal cells to exhibit decreased growth rates, malignant cells do not experience loss of contact inhibition. Loss of contact inhibition is a phenomenon where normal cells stop dividing when they reach confluence, or a single layer of cells completely covers the bottom of the culture dish. Malignant cells, on the other hand, continue to grow and divide even at confluence, piling up in multiple layers. This is one of the characteristic differences between normal cells and malignant cells.