To solve this problem, we need to identify the starter codon from the given options.$\newline$Let's analyze each option:$\newline \bullet$Option 1: AUG$\newline$ - AUG is the most common start codon in eukaryotes and prokaryotes.$\newline$ - It codes for the amino acid methionine in eukaryotes and a modified form of methionine (formylmethionine) in prokaryotes.$\newline$ - Therefore, AUG is the starter codon.$\newline \bullet$Option 2: UGA$\newline$ - UGA is a stop codon, not a start codon.$\newline \bullet$Option 3: UAA$\newline$ - UAA is also a stop codon.$\newline \bullet$Option 4: UAG$\newline$ - UAG is another stop codon.$\newline$Therefore, the correct answer is Option 1: AUG, which is the starter codon.