How many codons are possible in a cell?

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(D) The genetic code is composed of triplets of nucleotides,known as codons.Since there are $4$ types of nitrogenous bases $(A, U, G, C)$ in $RNA$,and

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$64$

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(D) The genetic code is composed of triplets of nucleotides,known as codons.Since there are $4$ types of nitrogenous bases $(A, U, G, C)$ in $RNA$,and each codon consists of $3$ bases,the total number of possible combinations is $4^3 = 4 	imes 4 	imes 4 = 64$.Out of these $64$ codons,$61$ code for amino acids,and $3$ are stop codons (nonsense codons) that do not code for any amino acid.Therefore,the total number of possible codons is $64$.

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