Question

Normal cells may undergo changes during cell processes that can lead to

cancer. However, most of them do not form cancers.
Which of the following explanations accounts for the relatively low rates
of cancer?
A Cancerous cells die when they are exposed to radiation.
B Cancerous cells are crowded out by normal cell growth.
C Cancer cells grow only very slowly at first.
D DNA repair systems fix the mutation before it causes cancer.

Answer 1

Normal cells may undergo changes during cell processes that can lead to cancer. However, most of them do not form cancer because DNA repair system fix mutation before it causes cancer.

Step-by-step explanation:

The major checkpoints in the cell cycle are G1, S and G2 phase. During the S and G1 phase of interphase base excision repair system is most active and prevent passing of errors in the daughter cell. The daughter cells are formed in the mitosis, it is in this phase if the mutation has been in the DNA the cells would replicate abnormally.