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Question
Choose the correct answer from the alternatives given :
Polycistronic messenger RNA (mRNA) usually occurs in
Choose the correct answer from the alternatives given :
Polycistronic messenger RNA (mRNA) usually occurs in
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Solution
The correct option is B Both (a) and (b)
When a particular gene codes for a mRNA strand it is said to be monocistronic or monogenic.When several genes (cistrons) are transcribed into a single mRNA molecule, it is described as. polycistronic or polygenic. Prokaryotic mRNA are polycistronic.Their translation begins even during their synthesis. They are short-lived and hardly undergo any processing, hence they do not possess a poly A tail at 3 end. Eukaryotic mRNA are monocistronic. Their translation begins only when the transcription has been completed. Thus, they are more stable than the prokaryotic mRNA. The transcribed RNA (hnRNA) undergoes processing (capping, methylation and polyadenylation) to form the mRNA molecule.So, the correct answer is 'both (a) and (b)'.
When a particular gene codes for a mRNA strand it is said to be monocistronic or monogenic.
When several genes (cistrons) are transcribed into a single mRNA molecule, it is described as. polycistronic or polygenic. Prokaryotic mRNA are polycistronic.
Their translation begins even during their synthesis. They are short-lived and hardly undergo any processing, hence they do not possess a poly A tail at 3 end. Eukaryotic mRNA are monocistronic. Their translation begins only when the transcription has been completed. Thus, they are more stable than the prokaryotic mRNA. The transcribed RNA (hnRNA) undergoes processing (capping, methylation and polyadenylation) to form the mRNA molecule.
So, the correct answer is 'both (a) and (b)'.
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