Which statement is correct for homeotic genes?

Few genes are found in all types of cells of differentiated multicellular organisms of higher classes. These are called:

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

Jacob and Monod studied lactose metabolism in $E. coli$ and proposed the operon concept,which is applicable for:

During lactose metabolism in $E. coli$,the repressor protein binds to the ...........

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.