12th Class Biology Molecular basis of inheritance

  • question_answer 57)   Define a cistron Giving examples differentiate between monocistronic and polycistronic unit.


                      A cistronis strath of bass sequences that codes for one polypeptide chain including adjacent control regions. it may also code fortRNA, rRNA molecule or may perform other specific functions including regulating functions of other cistrons. This term has replaced the definition of agene. Monocistronic transcription unit will have all the regulatory and coding sequences for a single polypeptide, whereas polycistronic mayhave ceding sequences for more than one polypeptide. In eukaryotic cells almost the messenger RNAs are monocistronic in prokaryotes, lacoperon cooing sequence would be an example of polycistronic DNA region.

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