Gene Structure: Polycistronic vs monocistronic <ul><li>Cistron : an old name for a gene </li></ul><ul><li>Polycistronic :...
Monocistronic vs Polycistronic Transcription <ul><li>Prokaryotes – Both </li></ul><ul><li>Eukaryotes </li></ul><ul><ul><l...
Why does prokaryotes have polycistronic while eukaryotes have monocistronic? <ul><li>Eukaryotes don’t need everything so b...
The lac Operon P O lacZ lacY lacA P O lacZ lacY lacA mRNA 5’ 3’ RIBSOSOME BINDING SITE Q: How many proteins are made?
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Polycistronic gene

Ncert plus two biology surendran aduthila
Published on: Mar 4, 2016
Published in: Education      
Source: www.slideshare.net


Transcripts - Polycistronic gene

  • 1. Gene Structure: Polycistronic vs monocistronic <ul><li>Cistron : an old name for a gene </li></ul><ul><li>Polycistronic : 1 promoter directs synthesis of 1 mRNA that can be translated to more than one polypeptide </li></ul><ul><ul><li>Prokaryotic genes </li></ul></ul><ul><li>Monocistronic : 1 promoter directs synthesis of 1 mRNA that usually translates to only 1 protein </li></ul><ul><ul><li>Eukaryotic genes </li></ul></ul>
  • 2. Monocistronic vs Polycistronic Transcription <ul><li>Prokaryotes – Both </li></ul><ul><li>Eukaryotes </li></ul><ul><ul><li>Nucleus – Monocistronic (polycistronic rare) </li></ul></ul><ul><ul><li>Mitochondria </li></ul></ul><ul><ul><ul><li>Mammals – polycistronic (2 promoters); pre-RNAs processed into smaller species </li></ul></ul></ul><ul><ul><ul><li>Other – Both </li></ul></ul></ul><ul><ul><li>Chloroplast - Both </li></ul></ul>
  • 3. Why does prokaryotes have polycistronic while eukaryotes have monocistronic? <ul><li>Eukaryotes don’t need everything so by using monocistronic, they can regulate what is being created without creating too much of unnecessary resources. </li></ul><ul><li>Prokaryote uses polycistronic because they genome is small and want to make everything in one pathway together. </li></ul>
  • 4. The lac Operon P O lacZ lacY lacA P O lacZ lacY lacA mRNA 5’ 3’ RIBSOSOME BINDING SITE Q: How many proteins are made?