Assertion :Untranslated regions are sequences of RNA before initiation codon and after termination codon. Reason: Untranslated regions provide stability to mRNA and also increase translational efficiency.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
A translational Unit in mRNA is the sequence of RNA that is flanked by the start codon (AUG) and the stop codon and codes for a polypeptide. An mRNA has some additional sequences that are not translated and are referred as untranslated regions (UTR). The UTRs are present at both 5-end (before start codon) and 3-end (after stop codon). They are required for efficient translation process.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

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