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B
AUG
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C
UAG
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D
UAA
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Solution
The correct option is B AUG
AUG or methionine codon is a sense codon having a dual function. Duality in the codon function is known in the initiation of translation and methionine insertion into internal protein positions.
When AUG is at the beginning of prokaryotic message (initiation codon), it codes for the incorporation of N- formyl methionine (fMet) whereas AUG within the message code for normal methionine (Met). UGA (opal), UAG(amber) and UAA (ochre) are non-sense codons as they do not specify any amino acid and when present in the reading frame lead to polypeptide chain termination.