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Splicing

Splicing pre-mRNAIn eukaryotes, transcription results in pre-mRNA which is a length of RNA with both non-coding and coding sequences.The non-coding sequences are called introns and need to be spliced out to make functional mRNA.The introns are removed and the coding sequences called exons are joined together.The mRNA leaves the nucleus through the nuclear pore.In prokaryotes the mRNA has no introns so splicing does not take place.

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Specification: OCR Biology A (H020), AS-level, 2.1.2 Biological molecules. Topic: Biological Molecules.

Key terms in this lesson

prokaryotic cell
A cell with no nucleus or membrane-bound organelles, found in bacteria.
eukaryotic cell
A cell with a nucleus and membrane-bound organelles, found in animals, plants, fungi and protoctists.
transcription
The synthesis of a complementary mRNA strand from a DNA template, which takes place in the nucleus.

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