Topic: Transcription, genetic code, translation, protein biosynthesis· Genetics and Evolution
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:
1. Promotor, Structural gene, Terminator
2. Repressor, Operator gene, Structural gene
3. Structural gene, Transposons, Operator gene
4. Inducer, Repressor, Structural gene