Assertion :An mRNA has both initiation codon and termination codon.
Reason: It specifies only a single polypeptide or number of them.

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 D Both Assertion and Reason are incorrect
mRNA is a long RNA. It gets attached to ribosome. mRNA has methylated region at the 5' terminus. It functions as a cap for attachment with ribosome. Cap is followed by an initiation codon (AUG) either immediately or after a small noncoding region. Then there is coding region followed by termination codon (UAA, UAG or UGA). There is then a small noncoding region and poly A area at the 3' terminus. An mRNA may specify only a single polypeptide or a number of them. The former is called monocistronic while the latter is known as polycistronic.
So, the correct answer is 'Both Assertion and Reason are incorrect'.

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