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This is not quite true. DNA does not instruct the cell. DNA only stores the information, but it's the proteins that are the functional product of that information.The genetic code translates DNA information into protein products.Well, just like you can program your phone to beep for specific reasons, DNA instructs the cell. DNA is a three-billion-lettered program telling the cell to act in a certain way. It is a full instruction manual.14
DNA needs proteins and proteins need DNA. This has been called irreducibly complex, but that does not mean it did not or could not evolve.
Simulations have shown how a simple code can evolve into the genetic code we see today throuh a series of gradual steps.You cannot find instruction, precise information like this, without someone intentionally constructing it.