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Start codonplugin-autotooltip__default plugin-autotooltip_bigCodon: a three nucleotide sequence that is read by the ribosome and specifies an amino acid that is added to a growing poplypeptide chain based on the genetic code.: usually the first AUG RNA sequenceplugin-autotooltip__default plugin-autotooltip_bigSequence: the precise order of monomers in a polymer. In DNA, it refers to the order of G, A, T, and C nucleotides. In RNA, it refers to the order of G, A, U, and C nucleotides. In proteins, it refers to the order of amino acids. starting from the 5' end of the mRNAplugin-autotooltip__default plugin-autotooltip_bigmessenger RNA (mRNA): an RNA molecule that codes for protein. and reading in the 3' direction. AUG signals the ribosomeplugin-autotooltip__default plugin-autotooltip_bigRibosome: a very large and complex enzyme formed from both protein and rRNA subunits. Its primary function is to catalyze translation. to start translationplugin-autotooltip__default plugin-autotooltip_bigProtein translation: the process of using an mRNA as a template to synthesize a protein based on the genetic code, using ribosomes.. AUG also codes for the amino acidplugin-autotooltip__default plugin-autotooltip_bigAmino acid: molecules that are polymerized to form proteins. methionine.