If you wished to study the SOS response in Escherichia coli, which of the following experimental procedures could be used?
A. Inactivate genes that encode DNA polymerases.
B. Expose cells to ionizing radiation for 10 minutes.
C. Transfer log phase cells from complete medium to thymine minimal medium.
D. Expose cells to nonionizing radiation for 20 minutes.
E. All of the choices are correct.
Answer: E
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