(A) transcription unit in $DNA$ is defined primarily by three regions in the organism: $1$. $A$ promoter $2$. The structural gene $3$. $A$ terminator

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(A) transcription unit in $DNA$ is defined primarily by three regions in the organism: $1$. $A$ promoter $2$. The structural gene $3$. $A$ terminator An inducer is a molecule that regulates gene expression (often associated with operons like the $lac$ operon) but is not a structural component of the transcription unit itself.