In translation initiation, the ribosome binds to the mRNA near its _____.

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Multiple Choice

In translation initiation, the ribosome binds to the mRNA near its _____.

Explanation:
The ribosome first binds the mRNA near the 5' end when translation starts. In eukaryotes, initiation factors recognize the 5' cap and bring in the small subunit at the beginning of the message, after which it scans in the 5'→3' direction to find the start codon. In bacteria, the small subunit binds near the 5' end at a region that aligns the start codon for proper translation. The start codon itself is the actual site where protein synthesis begins, but the ribosome must bind upstream of it to set the reading frame. The 3' end and the poly-A tail lie downstream and are not where initiation starts.

The ribosome first binds the mRNA near the 5' end when translation starts. In eukaryotes, initiation factors recognize the 5' cap and bring in the small subunit at the beginning of the message, after which it scans in the 5'→3' direction to find the start codon. In bacteria, the small subunit binds near the 5' end at a region that aligns the start codon for proper translation. The start codon itself is the actual site where protein synthesis begins, but the ribosome must bind upstream of it to set the reading frame. The 3' end and the poly-A tail lie downstream and are not where initiation starts.

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