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

Which of the following statements are correct?
$(i)$ From one molecule of $\text{DNA}$,several molecules of $\text{RNA}$ can be formed.
$(ii)$ The $\text{RNA}$ forming part is known as the translational unit.
$(iii)$ The promoter is located at the $5'$ upstream end.
$(iv)$ The promoter and terminator flank the structural gene in a transcription unit.

$A$: Single $DNA$ dependent $DNA$ polymerase catalyses transcription of all types of $RNA$ in all except bacteria.
$R$: Structural genes in bacteria are monocistronic.

During elongation of the polypeptide chain, the sigma factor is

In which of the following places is messenger $RNA$ $(mRNA)$ formed in a living cell?

$DNA$ transcription unit is defined primarily by three regions in $DNA$ with respect to upstream and downstream ends: