Consider the following results from an experiment performed by a scientist. Each experiment was performed repeatedly and the same results were obtained each time.

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Experiment        Result
#1, Pneumonia-causing strain of bacteria is injected into a rat.        Rat develops pneumonia.
#2, Non-pathogenic (harmless) bacteria is injected into a rat.        Rat does not contract pneumonia.
#3, Pneumonia-causing bacteria, that have been heat-killed, are injected into a rat.        Rat does not contract pneumonia.
# 4, Mixture of non-pathogen bacteria and heat-killed pneumonia-causing bacteria are injected into a rat.        Rat develops pneumonia.
Which of the following is the best explanation for the results of this experiment?
    The heat-killed bacteria were not really dead in experiment #4.
    The non-pathogenic bacteria in experiment #4 were really pathogenic.
    The heat-killed bacteria in experiment #4 cloned themselves before being heat-killed.
    The non-pathogenic bacteria in experiment #4 were changed into pneumonia-causing bacteria through transformation.
asked May 19, 2013 in Biology by anonymous
    

1 Answer

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The non-pathogenic bacteria in experiment #4 were changed into pneumonia-causing bacteria through transformation.
answered May 20, 2013 by Bioshare ~Top Expert~ (34,070 points)

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