Which process is shown in the figure below?

Give scientific reasons: Transcription and translation could be coupled in prokaryotic cell but not in eukaryotic cell.

Given below are two statements, one is labelled Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A) :$ In eukaryotes, primary transcripts $(hnRNA)$ contain both exons and introns, and introns are non-functional.
Reason $(R) :$ In bacteria, the $mRNA$ does not require any processing, and transcription and translation take place in the same compartment.
In the light of the above statements, choose the most appropriate answer from the options given below $:$

Spliceosomes are not found in cells of

Identification and binding of $RNA$ polymerase to the promoter sequence is a function of

Messenger $RNA$ $(mRNA)$ is produced in: