Which statement is least likely to support the endosymbiotic theory? a. mitochondria and chloroplasts reproduce independently from the cell. b. mitochondria and chloroplasts contain their own ribosomes. c. mitochondria and chloroplasts have dna that resembles bacterial dna. d. mitochondria and chloroplasts are much larger than prokaryotic cells. the answer is d

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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not sure if this is what you'r looking for eubacteria and archaebacteria