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Draw the schematic structure and explain...

Draw the schematic structure and explain the different regions of a transcription unit.

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A transcription unit in DNA is defined primarily by the three regions in the DNA.
1. A promoter 2. The structural gene 3. A terminator
The promoters and terminator flank the structural gene in a transcription unit. The promoter is located towards 5 end ( upstream ) of the structural gene. The promoter provides binding site for RNA polymerase.
Terminator is located towards `3^(l)` end ( downstream ) of the coding strand and it helps in ending the transcription process. Structural genes are those that code for polypeptides and structural genes present in between promoter and terminator.
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(a) Draw a schematic representation of the structure of a transcription unit and show the following in it : (i) Direction in which transcription occurs (ii) Polarity of the two strands involved (iii) Template strand (iv) Terminator gene. (b) Mention the function of promoter gene is transcription.