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A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?
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Three
The sequence of bases in mRNA are read in a serial order in groups of three at a time. Each triplet of nucleotides (having a specific sequence of bases) in known as codon. Each codon specifies one amino acid. Further since, there are four bases. therefore, $4^{3}=64$ triplets or codons are possible.
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