What Happens When a Stop Codon Is Reached by a Ribosome

question 50

Multiple Choice

What happens when a stop codon is reached by a ribosome (in the A site) ?

• A) A termination tRNA^ter binds to the codon and is used to release the growing peptide from the P site tRNA. The ribosome then dissociates.
• B) A termination tRNA^ter binds to the codon and the growing peptide is transferred to it. When the peptidyl-tRNA^ter reaches the P site, the ribosome is signaled to release the protein. The ribosome then dissociates.
• C) A termination protein binds to the codon and is used to release the growing peptide from the P site tRNA. The ribosome then is likely to dissociate.
• D) A termination protein binds to the codon and the ribosome dissociates. A separate peptidyl transferase then releases the protein from the last tRNA to which was attached.

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