Introns and Exons

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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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