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List four observations that indicate that a chemical reaction may be taking place

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?