Question

Why do prokaryotes have polycistronic mrna?

Answer 1

polycistronic mRNA is a mRNA that several proteins and characteristic is of many bacteria and chloroplast mRNA..
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Answer 2

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Most of the prokaryotic mRNAs are polycistronic which means that multiple genes are present on a single transcript and the single promoter initiates transcription of all those genes and regulates their expression. They have multiple initiation and termination codons and thus translate more than one protein.