The incidence of cancer increases dramatically in older humans because
A)the Ras protein is more likely to be hyperactive after age sixty.
B)proteasomes become more active with age.
C)as we age, normal cell division inhibitors cease to function.
D)the longer we live, the more mutations we accumulate.
E)tumor-suppressor genes are no longer able to repair damaged DNA.

Question

Quizplus · Accepted Answer

The longer we live, the more mutations we accumulate, which increases the likelihood of cancer development. As we age, there are more opportunities for mutations to occur due to environmental factors, DNA replication errors, etc. Therefore, option D is the best choice.

The Incidence of Cancer Increases Dramatically in Older Humans Because