Why is the structural gene in a transcription unit of eukaryotes called monocistronic and that in prokaryotes /bacteria called polycistronic? give reason.
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A cistron is a segment of DNA that codes for a polypeptide (a polymer of amino acids). A cistron can be polycistronic (mostly in prokaryotes and bacteria), i.e. it can code for several proteins. It can also be monocistronic (mostly in eukaryotes) i.e. it codes for a single protein. The monocistronic genes in eukaryotes consist of coding sequences called exons and intervening sequences called introns. Exons appear in mature or processed RNA whereas introns do not.
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The structural gene in a transcription unit of eukaryotes called monocistronic because of the presence of introns (non- intervening sequences) and exons (coding sequences) while that in prokaryotes/bacteria called polycistronic as it is continuous with coding sequences.
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