AP BIOLOGY

Detailed explanation-1: -Rather than responding appropriately to the signals that control normal cell behavior, cancer cells grow and divide in an uncontrolled manner, invading normal tissues and organs and eventually spreading throughout the body.

Detailed explanation-2: -Cancer cells are cells gone wrong-in other words, they no longer respond to many of the signals that control cellular growth and death. Cancer cells originate within tissues and, as they grow and divide, they diverge ever further from normalcy.

Detailed explanation-3: -Cancer cells do not respond to signals that regulate cell GROWTH. Cancer cells form a mass of cells called a TUMOR. Cancer cells may break loose and SPREAD throughout the body. Cancer cells form tumors in other tissues by METASTASIS.

Detailed explanation-4: -Cancer cells do not exhibit contact inhibition. While most cells can tell if they are being ‘crowded’ by nearby cells, cancer cells no longer respond to this stop signal.

Detailed explanation-5: -Unlike normal cells, cancer cells don’t stop growing and dividing when there are enough of them. So the cells keep doubling, forming a lump (tumour) that grows in size.