Concept:A transcription unit includes a promoter, structural gene, and terminator along the DNA.
Key Fact:The promoter is at the
5′-end of the structural gene, and the terminator is at the
3′-end of the coding strand.
Explanation:The promoter binds RNA polymerase and also defines which DNA strand serves as the template and which as the coding strand.
The terminator signals the end of transcription.
All statements A, B, C, D, and E are correct according to the standard definition of a transcription unit.
Answer:Option D – A, B, C, D and E only.
