Which site on the ribosome acts as the exit site for polypeptides?

Study for the DNA Structure, Replication, Transcription and Translation Test with flashcards and multiple choice questions. Each question offers hints and explanations. Prepare thoroughly and excel in your exam!

Multiple Choice

Which site on the ribosome acts as the exit site for polypeptides?

Explanation:
In translation, three tRNA binding sites coordinate where aminoacyl-tRNA enters, where the growing chain is held, and where tRNA leaves. After the peptide bond forms, the ribosome moves so the now-empty tRNA reaches the exit site and exits the ribosome. That exit point is where tRNA departs, ending its role in that cycle, while the nascent polypeptide itself continues to emerge through the ribosome’s peptide tunnel. So the site designated as the exit point is the one where tRNA leaves, making it the correct choice.

In translation, three tRNA binding sites coordinate where aminoacyl-tRNA enters, where the growing chain is held, and where tRNA leaves. After the peptide bond forms, the ribosome moves so the now-empty tRNA reaches the exit site and exits the ribosome. That exit point is where tRNA departs, ending its role in that cycle, while the nascent polypeptide itself continues to emerge through the ribosome’s peptide tunnel. So the site designated as the exit point is the one where tRNA leaves, making it the correct choice.

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