Who proposed the operon model for the first time?

Structural gene is monocistronic $- P$
Structural gene is polycistronic $- Q$
Select the correct option for $P$ and $Q$.
$\quad\quad\quad P \quad\quad Q$

In the Operon concept,the regulator gene regulates chemical reactions in the cell by:

Transposons can be used in which of the following processes?

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

Match the following genes of the $Lac$ operon with their respective products.

$(a)\; i$ gene	$(i)\; \beta-\text{galactosidase}$
$(b)\; z$ gene	$(ii)\; \text{Permease}$
$(c)\; a$ gene	$(iii)\; \text{Repressor}$
$(d)\; y$ gene	$(iv)\; \text{Transacetylase}$

Select the correct option.