Which of the following is initiation codon?

AUG

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AUU

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UAG

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UVU

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Solution

The correct option is A AUG
The triplet "AUG" codes for methionine which serves as the first amino acid to be incorporated in a growing polypeptide chain; thus, "AUG" serves as initiation codon. "AUU" codes for isoleucine; UAG is a stop codon that do not codes for any amino acid but causes termination of translation. "UVU" is not a standard genetic code since the letter "V" does not denote any of five standard bases which are namely adenine, guanine, cytosine, thymine and uracil. Correct option is A.

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