Suppose an alien form of life is discovered on mars. which of the following macro molecules would have to be discovered in this creature before scientist could suggest life on earth and life on mars have similar methods for storing and transmitting genetic information?

On earth, the genetic material of all the life form is made up of nucleic acid. So all the information about the organism is stored in the nucleic acid which is transmitted to the next generation.

There are two types of nucleic acid present in life forms on earth i.e., ribonucleic(RNA) acid and deoxyribonucleic acid(DNA). Most of the organisms contain DNA to store its genetic material and some forms contain RNA as their genetic material.  

Therefore if an alien form of life is discovered on the mars then nucleic acid must be the following macro molecules would have to be discovered in this creature before scientists could suggest life on earth and life on mars have similar methods for storing and transmitting genetic information.

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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the real answer is b. scintillation counter