Frederick griffith performed an experiment in which a live culture of avirulent "rough" strain streptococcus pneumoniae bacteria were mixed with dead cells of virulent "smooth" streptococcus pneumoniae bacteria. subsequently, the "rough" bacteria were "transformed" into "smooth" bacteria capable of killing mice. this experiment demonstrated that

This experiment demonstrated the bacteria has the ability of transformation.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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