If the scientist used the cultures to perform another experiment using medium that contained lactose as the only energy source growth would most likely occur on which of the following plates

Answer 1

This question appears to be testing understanding of the lac operon. It is difficult to answer without seeing the plates in question. However, we can apply understanding of the lac operon to this question to arrive at a reasonable answer. When there is low glucose, the CAP molecule increases RNA polymerase binding to the promoter. When there is only lactose available, the repressor is released (repressor goes away). Thus, with no glucose and only lactose, you get increased promoter binding and decreased repressor binding. This allows for lac operon to express lactase. Hope this helps!