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Three codons on mRNA are not recognized ...

Three codons on mRNA are not recognized by transfer RNA. What are they? What is the general term used for them? What is their significance in protein synthesis?

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These codons are UAA, UAG and UGA. The general name given to these codons is nonsense codons. These codons do not specify any amino acid but the termination of polypeptide chain is signalled by them.
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