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Unformatted text preview: direction as the other nucleotides in the RNA transcript chain. Once in place, the cap plays a role in the ribosomal recognition of messenger RNA during translation into a protein . Prokaryotes do not have a similar cap because they use other signals for recognition by the ribosome. The Poly A Tail Post-transcriptional RNA processing at the opposite end of the transcript comes in the form of a string of adenine bases attached to the end of the synthesized RNA chain. This string of adenine is called the "poly A tail". The addition of the adenines is catalyzed by the enzyme poly (A) polymerase, which recognizes the sequence AAUAAA as a signal for the addition. The reaction proceeds through mechanism similar to that used for the addition of nucleotides during transcription. The poly A tail is found on most, but not all, eukaryotic RNA transcripts. Its significance remains unknown....
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