Cellular Control- post-transcriptional gene regulation 0.0 / 5 ? BiologyCellular processesA2/A-levelOCR Created by: Anca.aCreated on: 31-03-18 12:55 What are introns? non-coding DNA in between genes, not expressed. 1 of 6 What are exons? coding or expressed regions of DNA (genes) 2 of 6 First step: During transcription all DNA, including introns, is transcribed to mRNA = primary mRNA 3 of 6 Second step: Primary mRNA is edited - RNA introns are removed, remaining RNA exons are then joined together = secondary mRNA 4 of 6 What may happen to some RNA introns? may become non-coding transcription factors 5 of 6 Third step: Exons can be spliced together in different ways so that the same gene can code for more than one protein. 6 of 6
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