Question

In which of the ribosomal sites, the A site, P site, and/or E site, could the following be found? A. A tRNA without an amino acid attached B. A tRNA with a polypeptide attached C. A tRNA with a single amino acid attached

Short answer

A. E site, B. P site, C. A site

Step-by-step solution

Identify which tRNA goes to which ribosomal site

The A site accepts an aminoacyl tRNA. This tRNA has an amino acid attached. The P site holds the tRNA carrying the growing polypeptide chain. This tRNA has a polypeptide chain attached. The E site releases dissociated (uncharged) tRNAs so they can be recharged with free amino acids.

Match the given options with the appropriate sites

A. A tRNA without an amino acid attached would be found at the E site, as tRNAs in this site are uncharged. B. A tRNA with a polypeptide attached would be found at the P site, where the tRNA holds the growing peptide chain. C. A tRNA with a single amino acid attached would be found at the A site, as this is where tRNAs that are charged with an amino acid enter the ribosome.