What are the three stop codons?

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Study for the DAT Bootcamp Molecular Genetics Test. Enhance your knowledge with flashcards and multiple-choice questions, each offering hints and explanations. Prepare effectively for your exam!

Multiple Choice

What are the three stop codons?

Explanation:
Stop signals end translation. They are codons that do not code for amino acids but trigger termination of the polypeptide. The three stop codons in the standard genetic code are UAG (amber), UAA (ochre), and UGA (opal). When the ribosome encounters any of these, release factors promote cleavage of the finished polypeptide from the tRNA and dissociation of the ribosome. Other codons, like UGG, do encode amino acids (UGG codes for tryptophan), so any option that includes a non-stop codon cannot be the full set of stops. The correct trio is UAG, UAA, and UGA.

Stop signals end translation. They are codons that do not code for amino acids but trigger termination of the polypeptide. The three stop codons in the standard genetic code are UAG (amber), UAA (ochre), and UGA (opal). When the ribosome encounters any of these, release factors promote cleavage of the finished polypeptide from the tRNA and dissociation of the ribosome. Other codons, like UGG, do encode amino acids (UGG codes for tryptophan), so any option that includes a non-stop codon cannot be the full set of stops. The correct trio is UAG, UAA, and UGA.

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