One of these is not associated with termination of protein synthesis

UAA

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UAG

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UGA

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AUG

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Solution

The correct option is D AUG
The triplet "AUG" codes for methionine which serves as the first amino acid to be incorporated into a growing polypeptide chain; thus, "AUG" serves as the initiation codon. UAA, UGA and UAG are stop codons that do not code for any amino acid but causes termination of translation. Thus, the correct answer is option D.

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