Question

which statement best describes cancer cells?
o they grow as a single layer of cells.
o they cease to reproduce after 20 - 50 mitotic divisions.
o they reproduce only when needed to replace missing cells.
o they are not regulated by contact inhibition.

Explanation:

Normal cells stop growing when they come into contact with other cells (contact - inhibition). Cancer cells lack this regulation and can continue to grow and divide uncontrollably. They do not grow as a single layer, can reproduce far beyond 20 - 50 mitotic divisions, and do not reproduce only when needed for cell replacement.

Answer:

They are not regulated by contact inhibition.