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When was the genetic code completed?

  • A.1958
  • B.1952
  • C.1966
  • D.1968

Answer: C

Correct answer: 1966

The genetic code was completed in 1966, all 64 codons having been assigned, chiefly through the work of Nirenberg, Khorana and Holley - who shared the 1968 Nobel Prize for it. Nirenberg’s first assignment, poly-U coding for phenylalanine, had come in 1961.

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