What does the given figure represent?

$A$ gene that is responsible for the synthesis of a polypeptide chain is called a .......

What is the location of the product of the $Lac \, y$ gene?

Which of the following statements is incorrect regarding the $lac$ operon?

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

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 $:-$