alleryA transcription unit in DNA has three parts:
APromoter, structural gene, terminator
BOperator, structural gene, terminator only
C5′ cap, ORF, poly-A tail
DStart codon, exons, stop codon
Answer & Solution
Correct answer: A. Promoter, structural gene, terminator
**Transcription unit** = **(i) Promoter — RNA polymerase binding site (5′/upstream)**, **(ii) Structural gene — the segment transcribed**, **(iii) Terminator — defines where transcription ends (3′/downstream)**.
The strand actually copied is the *template* strand
the other is the *coding* strand.
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