AP BIOLOGY

Detailed explanation-1: -An example of a codon is the sequence AUG, which specifies the amino acid methionine.

Detailed explanation-2: -The codon AUG both codes for methionine and serves as an initiation site: the first AUG in an mRNA’s coding region is where translation into protein begins.

Detailed explanation-3: -Three of these codons are stop codons: UAA, UAG, and UGA. The remaining 61 codons encode 20 amino acids. Out of these 61 codons, the codon AUG (which encodes the amino acid methionine) also serves as a the start signal (start codon) for translation initiation.