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Which codon acts as the universal initiation codon ?

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

Answer: D

Correct answer: AUG

AUG is the start codon and also codes for methionine, which in bacteria is carried as N-formylmethionine. GUG can serve as an alternative start in some prokaryotic genes, but AUG is the universal one.

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