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| Description: Above, the 3’ terminus of the transcript is in the active site (denoted by Mg2+). Below, the enzyme has slipped backward, leaving the transcript terminus at the end of a nonbase-paired RNA tail, some five nucleotides long. Transcription can resume either by forward sliding of polymerase back to the structure depicted above or, more likely, by cleavage of the non-base-paired part of the transcript, creating a new base-paired 3’ terminus. Picture Stats: Views: 297 Filesize: 52.26kB Height: 270 Width: 306 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=35038 |