Experiment #1 (griffith): you inject mice with a strain of "smooth bacteria. a few days later you find that the
mice have died from pneumonia. you inject different mice with "rough bacteria and find that they all survive.
next, you heat the disease-causing smooth bacteria and then find that all of the mice survive. explain why.
you then decide to heat-kill the disease-causing smooth bacteria and mix them with live harmless rough
bacteria. you inject mice with the live bacteria from the mixture and find that the mice die of pneumonia. you
culture the bacteria to find that there are now live disease-causing smooth bacteria. how do you explain this?