In bacteria, what binds with the repressor to activate the lac operon? Biology Signal Transduction and Control of Gene Expression Lac Operon 1 Answer Rawda Eada Jan 1, 2016 Lactose sugar Explanation: Answer link Related questions How does the a lac operon switch off? How are lac operons regulated? What is a lac operon? What is a regulatory gene? What is the regulatory gene, or the regulatory elements in an operon? Is the lac operon a negative or positive control system? What is the function of the lac-A gene in the lac operon? What is a repressible operon? How does lactose get into an E. coli cell if the lac operon is turned "off" and the cell is not... What causes the lac operon to shut off? See all questions in Lac Operon Impact of this question 5751 views around the world You can reuse this answer Creative Commons License