What is the main difference between a stem cell and a cancer cell?

A. A stem cell grows at a faster rate than a cancer cell

B. A stem cell obeys signals to stop growth, but a cancer cell doesn't

C. A stem cell is usually external; a cancer cell is usually internal

D. A stem cell doesn't die, but a cancer cell can be killed with treatment

I chose B

correct.

Correct! The main difference between a stem cell and a cancer cell is that a stem cell obeys signals to stop growth, while a cancer cell does not.

Stem cells are undifferentiated cells that have the ability to develop into various types of cells in the body. They have the unique characteristic of being able to divide and produce more stem cells or differentiate into specialized cells. Importantly, stem cells are regulated by signals and signals from the body that control their growth and differentiation. These signals ensure that stem cells only divide and differentiate when needed, helping to maintain the balance in our tissues and organs.

On the other hand, cancer cells arise from normal cells that have undergone genetic mutations, causing them to divide and grow uncontrollably. Unlike stem cells, cancer cells do not obey the signals that regulate growth. These mutated cells evade normal growth controls and continue to divide indefinitely, forming a mass of cells we know as a tumor. The ability of cancer cells to ignore signals that would normally stop their growth is a key characteristic of cancer.

So, in summary, while a stem cell obeys signals to stop growth and maintains a regulated balance, a cancer cell does not respond to these signals and grows uncontrolled.