Which of the following is required as inducer(s) for the expression of Lac operon?

Jacob and Monad studied lactose metabolism in E. coli and proposed operon concept, which is applicable for

Wild type E.coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as the sugar. Which one of the following changes take place

'Operon model' for gene regulation in bacteria was proposed by

In lac operon, $z$ gene codes for:

Which of the following switch off lac operon