A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and downstream end:
Structural gene, Transposons, Operator gene
Inducer, Repressor, Structural gene
Promotor, Structural gene, Terminator
Repressor, Operator gene, Structural gene
a transcription unit in DNA is defined primarily by three regions: (i) A Promoter, (ii) The Structural gene, and (iii) A Terminator . The promoter is located towards the 5'-end (upstream) of the structural gene, and the terminator is located towards the 3'-end (downstream) of the coding strand .
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