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Introns & Exons

What are cist...

Question

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

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Solution

A cistron is a section of a DNA or RNA molecule that codes for a specific polypeptide in protein synthesis.

Prokaryotic genes are called polycistronic because the mRNA codes for more than one protein.

Eukaryotic genes are monocistronic because the mRNA codes for only one protein.

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State whether true or false.

Prokaryotic genes are polycistronic while eukaryotic genes are monocistronic.

Q. Assertion :Polycistronic mRNA, found in prokaryotes, specify a number of polypeptides. Reason: Monocistronic mRNA, found in eukaryotes, specify only a single polypeptide.

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.

Q. Bacteria are called prokaryotes whereas higher organisms are called Eukaryotes. Why?

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.

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BIOLOGY

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Introns & Exons

Standard XII Biology

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