The P site and the A site of the ribosome hold the growing polypeptide chain during translation. The P site is where the tRNA carrying the growing polypeptide is located, and the A site is where the new tRNA carrying the next amino acid in the sequence enters.
The ribosome is the organelle that contains a P (peptidyl) and A (aminoacyl) site where mRNA is translated into a protein. Transfer RNA (tRNA) molecules carrying amino acids bind to these sites during the process of protein synthesis.
Popliteal Pulse
The new tRNA brings an amino acid to the A site on the ribosome. This is where the transfer of the growing polypeptide chain from the tRNA in the P site to the newly arriving amino acid on the tRNA in the A site occurs.
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A tRNA moves through the ribosome binding sites in the following order: A (aminoacyl) site, P (peptidyl) site, and finally E (exit) site. This movement occurs during the process of translation where the tRNA delivers amino acids to the growing polypeptide chain.
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