a transcription unit in DNA is defined by three primary regions: a promoter, a structural gene, and a terminator . The promoter is a specific DNA sequence that serves as the binding site for RNA polymerase, and its location also defines which strand will act as the template for RNA synthesis . In bacteria, the RNA polymerase binds to the promoter to initiate the transcription process . Understanding these molecular components is a high-priority strategy for medical aspirants, as NCERT textbooks provide the foundation for approximately 95% of NEET Biology questions .