In Operon concept, regulator gene functions as

In an inducible operon, the genes are

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

Functioning of structural genes is controlled by

Genes that are involved in turning on or off the transcription of a set of structural genes are called

Which enzyme will be produced in a cell if there is a nonsense mutation in the lac $Y$ gene?