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BIOLOGY TOPIC 7 NUCLEIC ACIDS (HL)

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Question:

What are 3 post-transcriptional modifications?

Author: Sammy Universe

What are 3 post-transcriptional modifications?



Answer:

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


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