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Cells stop dividing because the telomeres, protective bits of DNA on the end of a chromosome required for replication, shorten with each copy, eventually being consumed, as described in the article on telomere shortening.

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14y ago
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12y ago

Contact inhibition, when it touches other cells. The protein cylin regulates the cell cycle. Growth also affects the cell, its external chemical hormones tell the cell to stop dividing. If the cell doesn't stop dividing, it forms cancer.

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13y ago

Telomeres on the end of a strand of DNA shorten until apoptosis is triggered.

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12y ago

Cells stop dividing when your energy source is depleted. That's why you die when you don't eat.

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15y ago

Well young pupil,

i believe it is the Hayflick Limit.

There, you go i very good answer.

USE IT WISLY!

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13y ago

No, they divide every 20 mins

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Q: What are the 2 ways cells know when to stop dividing?
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