How do stop codons on mRNA function to end protein synthesis?
A. Since the stop codon is composed of more than three nucleotide bases, a stop codon cannot enter the ribosome, which forces protein synthesis to end.
B. The polypeptide chain breaks away from the ribosome when the amino acid. methionine, is added to the chain in response to a stop codon.
C. Protein synthesis ends at a stop codon because the stop codon does not code for an amino acid, so new amino acid is added to the polypeptide chain.
D. A series of three stop codons in a row adds the three amino acids that signal the terminal end of the growing polypeptide chain.