In the first step of their experiments, Jacob and Monod treated E. coli cells with ultraviolet light or X-rays to ________.
A) decrease the rate of gene expression
B) induce DNA repair enzymes
C) increase the frequency of mutations in all genes
D) selectively mutate the lac operon, leaving all other genes unmutated

Question

Quizplus · Accepted Answer

Jacob and Monod treated E. coli cells with ultraviolet light or X-rays to increase the frequency of mutations in all genes, not just the lac operon. This allowed them to isolate mutant strains with specific defects in the lac operon.

In the First Step of Their Experiments, Jacob and Monod