It is best to add just enough dye to cover the smear so reagents are not wasted. If the dye evaporates that doesn't matter.
True or false?

False the goal was to cover the smear if it evaporates the smear is uncovered meaning the goal wasn’t meant. It could also be true though because you could just apply more dye to cover it up. So it might be true

The infrared (ir) and the ultraviolet(uv) represent the two extremities of the visible spectrum (400-700nm). while ir represents electromagnetic radiation with wavelengths longer than those of visible light, uv represents wavelengths shorter than visible light

Lipid because of the high percentage of carbon to carbon bonds, which store more energy than other bonds.