What do E, P, A stand for?

What do E, P, A stand for?

• A. Exit site, Peptidyl tRNA site, The aminoacyl tRNA site
• B. End site, Protein site, Aminoacyl site
• C. Entrance, Peptide, Attachment
• D. Exit, Propeptide, Activation

Answer: (A)

These letters denote the three tRNA binding pockets on the ribosome that drive protein synthesis. The A site is the aminoacyl-tRNA site where a new aminoacyl-tRNA enters and pairs with the mRNA codon. The P site holds the peptidyl-tRNA, which carries the growing polypeptide chain. The E site is the exit site where the now-empty tRNA leaves after transferring its amino acid to the chain. So the sequence aligns with Exit site, Peptidyl tRNA site, and the aminoacyl tRNA site. The other options use terms that aren’t standard names for these ribosomal pockets.

These letters denote the three tRNA binding pockets on the ribosome that drive protein synthesis. The A site is the aminoacyl-tRNA site where a new aminoacyl-tRNA enters and pairs with the mRNA codon. The P site holds the peptidyl-tRNA, which carries the growing polypeptide chain. The E site is the exit site where the now-empty tRNA leaves after transferring its amino acid to the chain. So the sequence aligns with Exit site, Peptidyl tRNA site, and the aminoacyl tRNA site. The other options use terms that aren’t standard names for these ribosomal pockets.