Question

the following model represents the elongation stage of protein translation.
which arrow represents a trna leaving the ribosome after transferring an amino acid to a growing polypeptide chain?

Explanation:

During translation elongation, after a tRNA transfers its amino acid to the growing polypeptide, it exits the ribosome from the E (exit) site. In the sequence, the red tRNA (which first occupied the P site, donated its amino acid) is the one leaving, corresponding to arrow 3.

Answer:

Arrow 3 represents the tRNA leaving the ribosome after transferring its amino acid.