Ascientist wants to determine whether a new chemical she isolated can cure a certain disease. to test her hypothesis that the new chemical cures the disease more effectively than current treatments, she infects mice with the disease and gives them the new chemical. she then assesses how many mice were cured of the disease. what is missing from her experimental design?

       What is missing from her experimental design is a control group.

Explanation:

       Every scientific design nowadays need a control group. This control group will serve as a comparison to her after she treats the other group with her hypothesis. In this case, the control group needs to be related to her hypothesis, so it would be a control group treated with the old chemical treatment. With this, after she treats the mouse she can do the comparison and the math needed to finish her research.

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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