Introns and Exons
- Created by: Alia James
- Created on: 16-03-13 14:42
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In eukaryote cells, much of the DNA in the nucleas consits of introns - these are sequences of DNA bases that do not code for a polypeptide.
They occur within genes and are called 'introns' because they 'intrude' into the cistron but are not expressed as a polypeptide.
Other similar non-coding bits of DNA also occur between genes as multiple repeats of base sequences. The mRNA transcribed from DNA at first contains introns. These introns have to be removed before…
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