<P> In genetics, a transcription terminator is a section of nucleic acid sequence that marks the end of a gene or operon in genomic DNA during transcription . This sequence mediates transcriptional termination by providing signals in the newly synthesized transcript RNA that trigger processes which release the transcript RNA from the transcriptional complex . These processes include the direct interaction of the mRNA secondary structure with the complex and / or the indirect activities of recruited termination factors . Release of the transcriptional complex frees RNA polymerase and related transcriptional machinery to begin transcription of new mRNAs . </P> <P> Two classes of transcription terminators, Rho - dependent and Rho - independent, have been identified throughout prokaryotic genomes . These widely distributed sequences are responsible for triggering the end of transcription upon normal completion of gene or operon transcription, mediating early termination of transcripts as a means of regulation such as that observed in transcriptional attenuation, and to ensure the termination of runaway transcriptional complexes that manage to escape earlier terminators by chance, which prevents unnecessary energy expenditure for the cell . </P>

Why is it important to have a terminator sequence
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