Which ribosomal site holds the growing polypeptide chain during translation?

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Multiple Choice

Which ribosomal site holds the growing polypeptide chain during translation?

Explanation:
The growing polypeptide chain is held in the P site, where the peptidyl-tRNA resides. This site stores the tRNA carrying the elongating chain after each peptide bond is formed, until translocation moves the chain forward for the next step. The A site is where a new aminoacyl-tRNA enters to add its amino acid, and the E site is where the now-empty tRNA exits the ribosome. There isn’t a C site in this context, so the P site is the correct place for the growing chain.

The growing polypeptide chain is held in the P site, where the peptidyl-tRNA resides. This site stores the tRNA carrying the elongating chain after each peptide bond is formed, until translocation moves the chain forward for the next step. The A site is where a new aminoacyl-tRNA enters to add its amino acid, and the E site is where the now-empty tRNA exits the ribosome. There isn’t a C site in this context, so the P site is the correct place for the growing chain.

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