structural gene in a transcription unit is mostly polycistronic in
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The DNA sequence coding for tRNA or rRNA molecule also define a gene. However by defining a cistron as a segment of DNA coding for a polypeptide, the structural gene in a transcription unit could be said as monocistronic (mostly in eukaryotes) or polycistronic (mostly in bacteria or prokaryotes).
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prokaryotes is the answer.
- cistron means a gene that codes for a polypeptide.
- monocistronic are present in eukaryotes .
- ln prokaryotes no nuclear membrane is present and dna present is that's why naked. and to maintain the dna stability it should possess less amount of dna so unnecessary dna like promoters,etc for each gene are removed and same function related genes are put together and represent as polycistronic structural gene.
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