Which enzyme is primarily required for the process of transcription?

Identify the $INCORRECT$ statement with reference to transcription unit.

Given below are the two statements.
Statement $I$: Only one strand in the transcription unit functions as a template and is called the antisense strand.
Statement $II$: The non-template strand of the transcription unit is called the sense strand.
In the light of the above statements,choose the correct answer from the options given below.

The coding strand of $DNA$ is :
$5'AATTCAAATTAGG3'$
What is the sequence of $mRNA$ ?

Give scientific reasons: Both the strands of $DNA$ are not copied during transcription.

What happens when the sigma factor $(\sigma)$ binds to the $RNA$ polymerase?