I know that DNA is universal meaning that all organisms have the same 4 base pairs and also that the same codons code for the same amino acid in all organisms. What I am wondering is that say humans and bacteria and rats all have the same gene which codes for the same metabolic enzyme. Will the amino acid sequence of that protein enzyme also be the same in all three of those organisms? And that specific gene segment will also have the exact same base pair sequence in all three organisms too correct?