The presence of a membrane bound nucleus describes the evolution of eukaryotes from prokaryotic organisms. The endosymbiotic theory describes the same, the large cells engulfed the smaller ones, and the engulfed cells were not digested but started living in mutual cooperation with the engulfing cell. Mitochondria and chloroplast are thought to be the engulfed cell
Well, first off we would have more unlimited power supply and we would be able to get it easier because, the sun can produce harmful RB rays, all we would need to do is process it through a machine that can make it into a nuclear radiation rod that could be put into every electrical thing on this planet. We can also kill every one with the fire of a missile, and we could wipe the electrical currents of a nation out in one go.
UV light could change the DNA of the skin cells of the organism, possibly causing cancer cells to form.