Exon

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When the transcription of eukaryotic DNA by RNA polymerase occurs, the DNA transcribed produces pre-mRNA which includes both introns and exons.

Introns are non-coding elements of DNA (however, often have a regulatory function). Exons are the protein coding regions of DNA

Pre-mRNA is processed into mature mRNA by the removal and splicing of introns followed by the addition of a poly-A tail.  The mature mRNA is then suitable for translation into the coded proteins. 

Prokaryotic DNA only contain exons, whereas Eukaryotic DNA contain introns and exons.

The average length of a exon is 145 base pairs[1].

References

  1. Alberts B., Johnson A., Lewis J., Raff M., Roberts K., Walter P. (2008) Molecular Biology of the Cell, 5th edition, New York: Garland Science. Page 207.
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