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Question
Which of the following is true with respect to AUG?
Options
It codes for methionine only
It is an initiation codon
It codes for methionine in both prokaryotes and eukaryotes
All of the above
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Solution
All of the above
Explanation:
The codon AUG is unique because it serves as the universal initiation codon, signalling the ribosome to begin the process of translation. Beyond its role as a “start” command, it is the only codon that codes for the amino acid methionine, ensuring that this specific building block is the first one incorporated into most protein chains. This function is highly conserved across the tree of life, as AUG codes for methionine in both prokaryotes and eukaryotes, though prokaryotes use a slightly modified version called fMet for the starting position.
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