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

Which one of the following represents the correct sequence of different component genes in a $lac$-operon?

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?

In the $lac$ operon,which of the following acts as an inducer?

Write an explanatory note on gene expression.

The functional complex that consists of a cluster of genes including structural genes,a promoter gene,an operator gene,and a regulator gene was discovered by: