And a codon is basically a series of three consecutive nucleotides, where each codon corresponds to specific type of amino acids. So in the mRNA molecule, a series of three consecutive nucleotides, known as our codon, corresponds to some specific amino acid. For example, the sequence of nucleotides, our guanine, uracil. Uracil, corresponds to a specific amino acid known as valine. So to see what we mean, let's take a look at the following diagram. So, let's suppose our ribosomes in the cell take the following mRNA.