Which stop codons signal termination of translation in mRNA?

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Study for the Campbell Biology Concepts and Connections Test. Use flashcards and multiple choice questions, each with detailed explanations. Prepare thoroughly for your exam now!

Multiple Choice

Which stop codons signal termination of translation in mRNA?

Explanation:
Stop codons terminate translation. When the ribosome encounters one of the three stop codons—UAA, UAG, or UGA—it does not code for an amino acid. Instead, release factors bind and trigger release of the finished polypeptide chain from the ribosome. AUG is the start codon that signals where translation begins and it encodes methionine as the first amino acid. Because of this, the statement that UAG, UAA, UGA are stop codons is correct. The other options misstate the roles of AUG or the number of stop codons.

Stop codons terminate translation. When the ribosome encounters one of the three stop codons—UAA, UAG, or UGA—it does not code for an amino acid. Instead, release factors bind and trigger release of the finished polypeptide chain from the ribosome. AUG is the start codon that signals where translation begins and it encodes methionine as the first amino acid. Because of this, the statement that UAG, UAA, UGA are stop codons is correct. The other options misstate the roles of AUG or the number of stop codons.

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