Given below is the sequence of coding strand of $DNA$ in a transcription unit $\rm {AATGCAGCTATTAGG} - 5^{\prime}$ write the sequence of $(a)$ its complementary strand $(b)$ the $mRNA$

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;

Select the correct option:

Direction of $RNA$                 Direction of reading of
  synthesis                                the template $DNA$ strand

Write a explanatory note on Transcription unit and the gene.
 

Larger sub-unit of ribosome is composed of how many $rRNA$ molecules

It works as enzyme in bacteria.