Assertion :A monocistronic mRNA can produce several types of polypeptide chains. Reason: The terminator codon is present on the rRNA.

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.
Monocistronic mRNA is the mRNA that codes for only a single protein i.e. it can be translated to form only one type of protein. So monocistronic mRNA can produce only one type of polypeptide chains.
Hence, assertion is incorrect.
Terminator codon, which is also known as stop codon, is a triplet of nucleotides present on mRNA that signals for the termination of translation i.e. the site at which synthesis of polypeptide chain is terminated or stopped. Termination codons do not code for any amino acid.
Hence, reason is incorrect.
So, both assertion and reason are incorrect.
So, the correct answer is D.

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