Which of the following triplets signals termination of translation in mRNA?

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Study for the Campbell Biology Concepts and Connections Test. Explore flashcards and multiple-choice questions, complete with hints and explanations. Prepare for your success!

Multiple Choice

Which of the following triplets signals termination of translation in mRNA?

Explanation:
Translation termination is signaled by stop codons in the mRNA. The three stop codons, UAG, UAA, and UGA, do not code for amino acids; instead, they recruit release factors at the ribosome that promote releasing the finished polypeptide. The start codon AUG marks where translation begins and codes for methionine, so it signals initiation, not termination. Statements claiming that stop codons code for amino acids or that only one stop codon exists are incorrect, since all three function to terminate translation.

Translation termination is signaled by stop codons in the mRNA. The three stop codons, UAG, UAA, and UGA, do not code for amino acids; instead, they recruit release factors at the ribosome that promote releasing the finished polypeptide. The start codon AUG marks where translation begins and codes for methionine, so it signals initiation, not termination. Statements claiming that stop codons code for amino acids or that only one stop codon exists are incorrect, since all three function to terminate translation.

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