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When the transcription of [[Eukaryotic|eukaryotic]] [[DNA|DNA]] by [[RNA polymerase|RNA polymerase]] occurs, the [[DNA|DNA]] transcribed produces [[Pre-mRNA|pre-mRNA]] which includes both [[Introns|introns]] and exons. | When the transcription of [[Eukaryotic|eukaryotic]] [[DNA|DNA]] by [[RNA polymerase|RNA polymerase]] occurs, the [[DNA|DNA]] transcribed produces [[Pre-mRNA|pre-mRNA]] which includes both [[Introns|introns]] and exons. | ||
[[Introns|Introns]] are non-coding elements of DNA (however, often have a regulatory function). Exons are the [[Protein|protein]] coding regions of [[DNA|DNA]]. | [[Introns|Introns]] are non-coding elements of DNA (however, often have a regulatory function). Exons are the [[Protein|protein]] coding regions of [[DNA|DNA]]. | ||
Pre-mRNA is processed into mature [[MRNA|mRNA]] by the removal and splicing of [[Introns|introns]] followed by the addition of a [[Poly-A tail|poly-A tail]]. The mature [[MRNA|mRNA]] is then suitable for [[Translation|translation]] into the coded proteins. | Pre-mRNA is processed into mature [[MRNA|mRNA]] by the removal and splicing of [[Introns|introns]] followed by the addition of a [[Poly-A tail|poly-A tail]]. The mature [[MRNA|mRNA]] is then suitable for [[Translation|translation]] into the coded proteins. | ||
[[Prokaryotes|Prokaryotic]] [[DNA|DNA]] only contain exons, whereas [[Eukaryotic|Eukaryotic]] [[DNA|DNA]] contain [[Introns|introns]] and exons. | [[Prokaryotes|Prokaryotic]] [[DNA|DNA]] only contain exons, whereas [[Eukaryotic|Eukaryotic]] [[DNA|DNA]] contain [[Introns|introns]] and exons. | ||
The average length of a exon is 145 base pairs<ref>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.</ref>. | |||
=== References === | |||
<references /> | |||
Revision as of 22:47, 21 October 2013
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
- ↑ 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.