What codon marks the start of translation in mRNA?

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Multiple Choice

What codon marks the start of translation in mRNA?

Explanation:
The start of translation is signaled by a codon that recruits the ribosome and the initiator tRNA and fixes the reading frame. This signal is AUG, which codes for methionine. The initiator tRNA carrying methionine pairs with AUG, the ribosome assembles there, and translation proceeds from that point. The others don’t start translation: UAA is a stop codon that ends the polypeptide, UUU encodes phenylalanine, and GCU encodes alanine. So AUG uniquely serves as the start codon.

The start of translation is signaled by a codon that recruits the ribosome and the initiator tRNA and fixes the reading frame. This signal is AUG, which codes for methionine. The initiator tRNA carrying methionine pairs with AUG, the ribosome assembles there, and translation proceeds from that point. The others don’t start translation: UAA is a stop codon that ends the polypeptide, UUU encodes phenylalanine, and GCU encodes alanine. So AUG uniquely serves as the start codon.

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