Transcription: Eukaryotes-mRNA processing

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10 Terms

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What happens to pre-mRNA

The resulting mRNA is a pre-mRNA and it needs to be processed before translation can occur

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Exons

Regions of pre-mRNA that code for a protein

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Introns

Regions of pre-mRNA that do not code for a protein

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Splicing

removal of introns (do not code for a protein)

  • Catalyzed by the spliceosome


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Splicing is catalyzed by the
spliceosome. Considering
the composition of the
spliceosome and it's active
site, this molecule is an
example of a ____
facilitating a chemical
reaction.
a) Protein
b) Nucleic acid
c) Carbohydrate

b) Nucleic acid

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Spliceosome

composed of lots of small nuclear ribonucleoproteins (snRNPs)

  • The active site is RNA


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snRNPs

bind to the intron boundaries and pinch them together until boths ends are cut

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Mature mRNA

introns removed and exons are spliced together

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Gene expression

Cells control which genes are transcribed at which times.
This allows the cells to respond efficiently to changes in the
environment and to have a unique identity.