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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Definitions:

Zygote

A single cell formed through fertilization.

Implantation

The stage of pregnancy at which the embryo attaches to the wall of the uterus to begin development.

Prenatal Development

The process of growth and development within the womb from conception until birth.

Germinal

Relating to the earliest phase of embryonic development, in the first two weeks post-conception when the zygote begins to divide and grow.