Question

the following model represents the elongation stage of protein translation. which arrow represents an amino acid being added to a growing polypeptide chain? choose 1 answer: a arrow 1 b arrow 2 c arrow 3 d arrow 4

Explanation:

In the elongation stage of protein translation, a new amino acid (carried by a tRNA) is added to the growing polypeptide chain when the peptide bond forms between the new amino acid and the existing chain. Arrow 2 shows the tRNA with the new amino acid (purple) attaching to the ribosome and the amino acid being added to the polypeptide chain (the purple amino acid from the incoming tRNA is joining the chain). Arrow 1 is tRNA arriving, Arrow 3 is tRNA leaving, Arrow 4 is tRNA arriving. So Arrow 2 represents amino acid addition to the polypeptide chain.

Answer:

B. Arrow 2