The cellular clock theory holds that our cells divide
A) until trapped free radicals split them apart.
B) more quickly as we age, and so we die faster.
C) more efficiently as we age.
D) approximately 75-80 times before they die.

Question

Quizplus · Accepted Answer

The cellular clock theory states that cells can only divide a certain number of times (approximately 75-80) due to the shortening of telomeres, the protective caps on the ends of chromosomes. Once telomeres become too short, the cell can no longer divide and eventually dies. Therefore, answer D ("approximately 75-80 times before they die") is the best choice.

The Cellular Clock Theory Holds That Our Cells Divide