Question

What is cistron? Differentiate between monocistronic and polycistronic?

Answer 1

Answer:

Cistron can be defined as a segment of DNA capable of directing the synthesis of a polypeptide chain or RNA molecule. A mRNA molecule is said to be monocistronic when it contains the genetic information to translate only a single protein chain. Most of the mRNA found in the bacteria and archae is polycistronic.

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Answer 2

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A segment of DNA coding for polypeptide is called cistron. A cistron is basically a gene. If a stretch of replicating DNA contains a single cistron (or gene), it is called monocistronic. If a stretch of replicating DNA contains more than one cistron, it is called polycistronic, e.g. bacteria and prokaryotes.