(C) The genetic code is based on the combination of $4$ nitrogenous bases $(A, U, G, C)$. Since the code is a triplet (composed of $3$ nucleotides),th

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(C) The genetic code is based on the combination of $4$ nitrogenous bases $(A, U, G, C)$. Since the code is a triplet (composed of $3$ nucleotides),the total number of possible combinations is $4^3 = 4 \times 4 \times 4 = 64$. Therefore,there are $64$ codons in the genetic code.