$m\, -$ $RNA$ is formed by

A transcription unit in $DNA$ is defined primarily by the three regions in $DNA$ and these are with respect to upstream and down stream end;

$AGGTATCGCAT$ is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed $mRNA$?

In split genes, the coding sequences are called

Which of the following is correct for $m-RNA$ in eukaryotes ?

Explain (in one or two lines) the function of the followings:

$(a)$ Promoter

$(b)$ $tRNA$

$(c)$ Exons