The genetic code is the group of rules by that information encoded within genetic material DNA or mRNA sequences is changed into proteins (amino acid sequences) by living cells. The Biological decoding is accomplished by the ribosome that links amino acids in an order specified by mRNA, using transfer RNA (tRNA) molecules to hold amino acids and to read the mRNA 3 nucleotides at a time. The genetic code is highly similar between all organisms and can be expressed in an simple table with 64 entries.