Which of the following situations would be considered an example of positive regulation of gene expression in a prokaryote?
A) The CAP protein regulating the lac operon to be active when glucose is absent and lactose is present.
B) The CAP protein regulating the lac operon to be active when lactose is absent and glucose is present.
C) The repressor protein regulating the lac operon to be active when glucose is absent and lactose is present.
D) The repressor protein regulating the lac operon to be active when lactose is absent and glucose is present.
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