Question

which part of the cell cycle controls the repair of damaged dna, which, if unsuccessful, could eventually result in the abnormal cell division that typifies some types of cancer?
a. g1
b. s
c. m
d. g2

Explanation:

• In the G1 phase, the cell checks for DNA damage before entering the S phase (where DNA replication occurs). If damage is detected, the cell attempts to repair it. If repair is unsuccessful, the cell may undergo apoptosis (programmed cell death) to prevent the propagation of damaged DNA. Failure of this G1 checkpoint can lead to abnormal cell division, a characteristic of cancer.
• The S phase is for DNA replication.
• The M phase is for nuclear and cytoplasmic division.
• The G2 phase checks for proper DNA replication before mitosis.

Answer:

A. G1