Polycistronic transcription units are mostly found in genome of

mammals

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algae

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protozoa

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bacteria

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Solution

The correct option is D bacteria
By the process of transcription mRNA is formed, which moves the information from the DNA to the ribosomes for the production of proteins. Cistrons are nucleotide sequences that code for a single protein.

A cistron is a segment of DNA coding for a polypeptide.

All prokaryotes contain multiple cistronic units in their mRNA while eukaryotes have monocistronic mRNA. Bacteria are classified as prokaryotes because they lack a proper nucleus and membrane-bound organelles and hence they contain polycistronic mRNA.

Algae, protozoa and mammals all come under eukaryotes; they contain a clearly defined nucleus and distinct membrane-bound cell organelles and hence they form monocistronic mRNA derived from their nuclear DNA.

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Similar questions

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

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. What is transcription? What are the different parts of a DNA transcription unit? What is their role in the process of transcription?

Consider the following statements and select the options stating which ones are True (T) and which ones are False (F).

i. Monocistronic gene carries information for the synthesis of one polypeptide chain

ii. Polycistronic genes are mostly found in eukaryotes

iii. Promoter is located upstream of the structural gene i.e., towards 5' end of coding strand

iv. The TATA box is also called Hogness box in prokaryotes.

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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Central Dogma

Standard XII Biology

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