What is the function of a nonsense codon?

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Question

(A) nonsense codon,also known as a stop codon or termination codon,is a nucleotide triplet within $mRNA$ that signals the termination of translation.

Vedclass · Accepted Answer

It releases the polypeptide chain from $tRNA$.

Vedclass · Answer

(A) nonsense codon,also known as a stop codon or termination codon,is a nucleotide triplet within $mRNA$ that signals the termination of translation. The three stop codons are $UAA$,$UAG$,and $UGA$. These codons do not code for any amino acid. Instead,they are recognized by release factors,which cause the ribosome to release the completed polypeptide chain from the $tRNA$ and dissociate from the $mRNA$ molecule. Therefore,the correct function is to release the polypeptide chain.

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Assertion : $UAA, UAG$ and $UGA$ terminate protein synthesis.
Reason : They are not recognised by $tRNA$.

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