Final answer:
A codon is a three-nucleotide sequence in mRNA that directs protein synthesis.
Explanation:
Codon is the name given to a sequence of three nucleotides on mRNA that corresponds to a specific amino acid during protein synthesis. These codons are crucial in directing the assembly of proteins in cells. For example, the codon ATG not only encodes for Methionine but also serves as the start codon initiating protein synthesis.
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