Question

how do normal cells differ from cancer cells in the way they respond to cell cycle checkpoints?
normal cells ignore checkpoints, while cancer cells follow them
normal cells stop when errors are detected, while cancer cells do not
normal cells divide faster than cancer cells
normal cells cannot perform apoptosis, while cancer cells can

Explanation:

Normal cells stop when errors are detected at cell cycle checkpoints to prevent abnormal cell division. Cancer cells, however, ignore these checkpoints and continue dividing even with errors.

Answer:

Normal cells stop when errors are detected, while cancer cells do not.