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mRNA

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Question

why is cistron classified as monocistron and polycistron

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Solution

An mRNA molecule is said to be monocistronic when it contains the single genetic information to translate only a single protein. It is mainly found in the eukaryotic mRNAs.
But, polycistronic mRNA carries the information of several genes, which are translated into several proteins. It is mostly found in prokaryotes like bacteria and archea.

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What are cistrons? Why are eukaryotes called monocistronic and prokaryotes polycistronic?

Q. The structural gene in transcription unit is monocistronic and polycistronic respectively in:
[0.7 mark]

State whether true or false.

Prokaryotic genes are polycistronic while eukaryotic genes are monocistronic.

Q. Choose the right option from the statements given below.

Statement I: A monocistronic mRNA can produce several types of polypeptide chains.

Statement II: A monocistronic mRNA is usually found in eukaryotes.

Statement III: A polycistronic mRNA is usually found in prokaryotes.

Statement IV: A polycistronic mRNA can produce several types of polypeptide chains.

Statement V: A polycistronic gene is usually found in eukaryotes.

Q. Assertion :Transcription unit is often monocistronic in eukaryotes and polycistronic in prokaryotes . Reason: Exons do not appear in mature RNA, introns appear in mature RNA.

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