Q7 of 26 Page 1

What is a cistron? Why is the structural gene in a transcription unit of eukaryotes called monocistronic and that in prokaryotes/bacteria called polycistronic ? Give reasons.

A cistron is a segment of DNA that codes for a polypeptide. 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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