Post4 - Post-Transcriptional RNA Processing DNA...

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Post-Transcriptional RNA Processing DNA transcription occurs in a cell's nucleus. The RNA that is synthesized in this process is then transferred to the cell's cytoplasm where it is translated into a protein. In prokaryotes, the RNA that is synthesized during DNA transcription is ready for translation into a protein. Eukaryotic RNA from DNA transcription, however, is not immediately ready for translation . Post-transcriptional modifications OF RNA accomplish two things: 1) Modifications help the RNA molecule to be recognized by molecules that mediate RNA translation into proteins; 2) During post-transcriptional processing, portions of the RNA chain that are not supposed to be translated into proteins are cut out of the sequence. In this way, post-transcriptional processing helps increase the efficiency of protein synthesis by allowing only specific protein- coding RNA to go on to be translated. Without post-transcriptional processing, protein synthesis could be significantly slowed, since it would take longer for translation machinery to recognize RNA
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