What is the phenotype of an escherichia coli strain with a mutation in the lac operator that prevents the lac repressor from binding? Assume glucose is absent.

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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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her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.