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

Eukaryotic $RNA$ polymerase $III$ catalyzes the synthesis of

If the sequence of the coding strand in a transcription unit is written as follows:
$5'-ATGCATGCATGCATGCATGCATGCATGC-3'$. Write down the sequence of $mRNA$.

Define a cistron. Giving examples,differentiate between monocistronic and polycistronic transcription units.

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 $:$

What sequence on the template strand of $DNA$ corresponds to the first amino acid inserted into a protein?