The start codon codes for which amino acid?

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Study for the Molecular Genetics Exam. Explore flashcards and multiple-choice questions, each with hints and explanations. Enhance your understanding of genetics and prepare effectively for your exam!

Multiple Choice

The start codon codes for which amino acid?

Explanation:
Translation begins at the start codon AUG, which designates the amino acid methionine. The initiator tRNA carrying methionine pairs with AUG to kick off protein synthesis, so the first amino acid in the chain is methionine. In bacteria, this initiator tRNA is formylated, so the very first residue can be formylmethionine, though the codon still codes for methionine. In eukaryotes, the starting amino acid is methionine and it may be removed later in processing.

Translation begins at the start codon AUG, which designates the amino acid methionine. The initiator tRNA carrying methionine pairs with AUG to kick off protein synthesis, so the first amino acid in the chain is methionine. In bacteria, this initiator tRNA is formylated, so the very first residue can be formylmethionine, though the codon still codes for methionine. In eukaryotes, the starting amino acid is methionine and it may be removed later in processing.

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