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Which termination codon is called amber?

  • A.UAA
  • B.UAG
  • C.UGA
  • D.AUG

Answer: B

Correct answer: UAG

UAG is amber, UAA is ochre and UGA is opal. The names are historical accidents: amber is a translation of the surname of Harris Bernstein, whose family name means amber in German, and the other two were chosen to match. Amber suppressor mutations - tRNAs that read UAG as an amino acid - became a standard genetic tool.

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