Which of the following is not a component of the $Operon$ model?

Which enzyme is the expression product of the $y$ gene in the $lac$-operon?

Which enzyme$(s)$ is/are responsible for the transformation of lactose to galactose and glucose in the $E. coli$ culture medium?

Describe the regulation of gene expression in prokaryotes with an example.

Which of the following pairs does not exhibit complementarity?

In eukaryotes,the regulation of gene expression could be exerted at $:-$
$(I)$ Transcriptional level (formation of primary transcript)
$(II)$ Processing level (regulation of splicing)
$(III)$ Transport of $\text{mRNA}$ from nucleus to the cytoplasm
$(IV)$ Translational level
Choose the correct order for given statements $:-$