The start codon AUG codes for which amino acid?

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Multiple Choice

The start codon AUG codes for which amino acid?

Explanation:
AUG is the start signal for translation and specifies methionine as the amino acid to begin a protein. The initiator tRNA delivers methionine (in bacteria, it's formylmethionine, but the codon still encodes methionine as the amino acid). After initiation, the initial methionine is often removed or kept depending on the protein. The other listed amino acids—leucine, glycine, and valine—are specified by different codons, not the start codon. Therefore, the best answer is methionine.

AUG is the start signal for translation and specifies methionine as the amino acid to begin a protein. The initiator tRNA delivers methionine (in bacteria, it's formylmethionine, but the codon still encodes methionine as the amino acid). After initiation, the initial methionine is often removed or kept depending on the protein. The other listed amino acids—leucine, glycine, and valine—are specified by different codons, not the start codon. Therefore, the best answer is methionine.

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