What are 3 post-transcriptional modifications?

To form mature mRNA: Capping: 5' methyl (CH3) cap added to = prevents degradation by exonucleases Polyadenylation: 3' end is polyadenylated = poly-A tail added (AAAAA = adenines) improves stability and export from nucleus Splicing: introns (non coding sequences) are removed = continuous mRNA sequence from exons Introns = INTruding sequences and Exons = EXpressing sequences