What Happens When a Stop Codon Is Reached by a Ribosome

question 33

Multiple Choice

What happens when a stop codon is reached by a ribosome?

• 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 is likely to dissociate.
• 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 is likely to dissociate.
• C)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 dissociates.A separate peptidyl transferase then releases the protein from tRNA^ter.
• D)A release factor binds to the codon and is used to release the growing peptide from the P site tRNA.
• E)A release factor 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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