Question

question 14
a tumor results from a normal cell that
○ undergoes programmed cell death
○ divides uncontrollably
○ is stuck in the g1 phase
○ divides less than 50 times

Explanation:

A tumor is formed when a normal cell loses the ability to regulate its cell - division process. Normal cells have mechanisms to control when and how often they divide. Tumor cells, on the other hand, divide uncontrollably.

• Normal cells divide about 50 - 70 times (Hayflick limit), but tumor cells can divide indefinitely, so the option "divides less than 50 times" is incorrect.
• Normal cells can progress through the G1 phase (growth phase) and other phases of the cell cycle. Tumor cells are not "stuck" in the G1 phase; rather, they can move through the cell cycle in an unregulated way.
• Programmed cell death (apoptosis) is a normal process that eliminates damaged or unnecessary cells. Tumor cells often evade apoptosis, so the option "undergoes programmed cell death" is wrong.

Answer:

divides uncontrollably