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How many Nucleotides make up a Codon?

  • A.3
  • B.4
  • C.5
  • D.6

Answer: A

A codon is three nucleotides.

Three bases give \( 4^3 = 64 \) combinations for twenty amino acids and a stop signal, so the code is degenerate - most amino acids have more than one codon. Two bases would give only sixteen, too few.

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