Mark the incorrect option with respect to the $lac$ operon.

$A$ model that relates repetitive $DNA$ sequences and their transcripts of regulation in eukaryotes was proposed by

What is an operon?

Consider the following statements of gene regulation and select the correct statements $:$
$(A)$ Expression of genes is regulated by metabolic,physiological,or environmental conditions.
$(B)$ Galactose can act as an inducer for the lac operon.
$(C)$ The operator region is adjacent to the promoter elements in most operons.
$(D)$ In the lac operon,lactose is transported into the cell through the action of permease.
$(E)$ Regulation of the lac operon by a repressor is referred to as positive regulation.

Which organism was used by Beadle and Tatum to propose the one gene-one enzyme hypothesis?

Wild-type $E. coli$ cells are grown in a normal medium containing glucose. They are then transferred to a medium containing only lactose as the sugar source. Which of the following changes will occur?