text: The expression of an enzyme produced by this system is visually confirmed in a blue-white screen.
full_question: The expression of an enzyme produced by this system is visually confirmed in a blue-white screen. A scientist who studied this system theorized that it is characterized by the "diauxic growth" model. IPTG is an analog of a compound that induces this system. EIIA shuts down a permease enzyme and the catabolite activator protein, or CAP, inactivates this set of genes during unfavorable (*) environmental conditions. However, when conditions are right, cAMP binds to CAP, promoting this set of genes. Jacob and Monod won the Nobel for discovering this set of genes, which produces beta-galactosidase and is turned off when glucose is available. For 10 points, name this operon in E. coli which controls the metabolism of a sugar found in milk.
first_sentence: The expression of an enzyme produced by this system is visually confirmed in a blue-white screen.
raw_answer: lac operon [or lactose operon; prompt on operon until mentioned]