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| Description: The four internally complementary sequences that participate in attenuation (yellow) are shown, as well as the two trp codons (red) in region 1 that act as a pause site for RNA polymerase. The translational stop codon after region 1 may serve to prevent needless translation of those few full-length messages that are produced despite attenuation. Attenuation is a regulatory mechanism in which ribosome positioning on an mRNA determines whether transcription of an operon will terminate before transcription of the structural genes begins. Picture Stats: Views: 357 Filesize: 40.46kB Height: 179 Width: 381 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=35133 |