Which of the following is not a part of a transcription unit in $DNA$?

The removal of introns and joining of exons is known as.......

$RNA$ processing is:

$RNA$ polymerase $II$ is responsible for the transcription of . . . . . .

In which direction does $RNA$ polymerase catalyze polymerization?

Assertion: The transcription and translation can be coupled in bacteria.
Reason: In bacteria,since the $\text{mRNA}$ does not require any processing to become active,and also since transcription and translation take place in the same compartment.