The purpose of DNA or RNA in a virus. A. is to provide instructions to reproduce the virus
B. is to make the host cell replicate itself
C. is to cause the nuclear material to mutate
D. is to destroy the host cell

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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some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.