Identify a true statement about the cellular-clock theory.
A)The upper limit on human lifespan is at about 200 years.
B)As people age,cells become less capable of dividing.
C)The telomeres dramatically increase upon numerous replications.
D)People age because unstable oxygen molecules are produced inside their cells.

Question

Quizplus · Accepted Answer

The cellular-clock theory states that the reason people age is that cells become less capable of dividing over time. This is due to the shortening of telomeres, which are protective caps on the ends of chromosomes. As cells divide, the telomeres become shorter until they can no longer function properly, leading to cellular damage and ultimately, aging. The theory does not state an upper limit on human lifespan or that telomeres increase upon numerous replications. The production of unstable oxygen molecules inside cells is related to oxidative stress theory, not the cellular-clock theory.

Identify a True Statement About the Cellular-Clock Theory