Which stop codons signal termination of translation in mRNA?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $9.99Unlock all

Prepare for the Campbell Biology Concepts and Connections test. Hone your skills with multiple choice questions, flashcards, hints, and thorough explanations. Ace your exam effortlessly!

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.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy