RNA does all of those functions, thats why people think it was prevalent before DNA. There are very few DNA enzymes compared to RNA. RNA provides structure in c

RNA does all of those functions, thats why people think it was prevalent before DNA. There are very few DNA enzymes compared to RNA. RNA provides structure in complex with other molecules which is indirectly catalytic to their activity, as well as being catalytic directly from its own folded structure, then you also have coded information representing its own structure but later those of proteins with the establishment of the genetic code. But you have to remember ribosomes have to exist for the genetic code to mean anything, or at least whatever ribosomes looked like at the start, which is very likely just RNA and a couple of peptides.