GUG specifies amino acid valine. However, when functioning as initiation codon it specifies _____________.

Methionine

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Valine

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Lysine

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Isoleucine

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Solution

The correct option is A Methionine
Start codon indicates where to start the translation. The start codon specifies the amino acid methionine and is denoted by code AUG.
However, if AUG is absent, then GUG acts as a start codon and codes for methionine. So, most polypeptides begin with this amino acid.

So, option A is correct.

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