Question

one difference between a cancer cell and a normal cell is that
a. cancer cells divide uncontrollably.
b. normal cells divide uncontrollably.
c. cancer cells cannot make copies of dna.
d. normal cells have zero mutations

Explanation:

To solve this, we analyze each option:

• Option A: Cancer cells have mutations that disrupt normal cell cycle regulation, leading to uncontrolled division. This is a key characteristic of cancer cells.
• Option B: Normal cells divide in a controlled manner, regulated by checkpoints and signals, so this is incorrect.
• Option C: Cancer cells, like normal cells, can replicate their DNA (they need to divide, so DNA replication is part of their process), so this is wrong.
• Option D: Normal cells can have mutations (e.g., from environmental factors, errors in replication), just not the specific oncogenic mutations that drive cancer, so "zero mutations" is incorrect.

Answer:

A. cancer cells divide uncontrollably.