Marks the end of a gene and causes transcription to stop. marks the end of a gene and causes transcription to stop. rna ligase rna polymerase methionine a terminator

The answer is a terminator or transcription terminator. It is part of nucleic acid sequence that marks the end of a gene in DNA during transcription. This progression intercedes transcriptional termination by giving signals in the newly synthesized mRNA that activate processes which release the mRNA from the transcriptional complex. These processes comprise the direct interaction of the mRNA secondary structure with the complex and the meandering activities of recruited termination factors. 

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