In translation initiation, the ribosome scans the mRNA until it binds to the _____.

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Multiple Choice

In translation initiation, the ribosome scans the mRNA until it binds to the _____.

Explanation:
During translation initiation the ribosome must locate the start codon to establish the reading frame and begin building the polypeptide. The start codon, AUG, is the signal where the initiator tRNA pairs and the ribosome assembles the active complex to start synthesis. In bacteria, the Shine-Dalgarno sequence helps bring the ribosome to the correct region by base pairing with the 16S rRNA, positioning AUG so it can be used, but the initiation event occurs at AUG itself. The 3' end and the stop codon aren’t initiation signals—the stop codon marks termination, and the 3' end is simply the end of the mRNA.

During translation initiation the ribosome must locate the start codon to establish the reading frame and begin building the polypeptide. The start codon, AUG, is the signal where the initiator tRNA pairs and the ribosome assembles the active complex to start synthesis. In bacteria, the Shine-Dalgarno sequence helps bring the ribosome to the correct region by base pairing with the 16S rRNA, positioning AUG so it can be used, but the initiation event occurs at AUG itself. The 3' end and the stop codon aren’t initiation signals—the stop codon marks termination, and the 3' end is simply the end of the mRNA.

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