The one gene-one enzyme hypothesis was postulated by

Which of the following acts as an inducer for the $lac$ operon in $Escherichia$ $coli$?

In the $lac$ operon concept of gene expression,allolactose acts as:

Which of the following statements concerning the regulatory gene $(i)$,associated with the $lac$ operon are incorrect?
$(I.)$ $\text{mRNA}$ is transcribed from the $i$ gene whether lactose is present or not.
$(II.)$ $\text{mRNA}$ is transcribed from the $i$ gene only when the lactose is present.
$(III.)$ $\text{mRNA}$ is transcribed from the $i$ gene only when the lactose is not present.
$(IV.)$ Lactose inhibits the translation of $i$ gene $\text{mRNA}$.

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

How is gene expression regulated in eukaryotes?