Place the following events in the order in which they occur when cells stop dividing at a G1 checkpoint after the cells have been irradiated.
1. Production of p21.
2. DNA damage.
3. Inactivation of cyclin-Cdk complex.
4. Activation of p53.
5. Activation of ATM/ATR
A. 1-2-3-4-5
B. 2-5-4-1-3
C. 2-5-1-3-4
D. 5-4-3-2-1
Answer: B. 2-5-4-1-3
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