question: How many possible codons are there ?
answer: There are 64 possible codons ( four possible nucleotides at each of three positions , hence 43 possible codons )
turker_answer: There are 64 possible codons ( four possible nucleotides at each of three positions , hence 43 possible codons )
rule-based: There are there are 64 possible codons ( four possible nucleotides at each of three positions , hence 43 possible codons .