A molecular biologist extracts DNA from a lactose positive (Lac ) strain of coli and a penicillin-resistant (PCr) strain of S. aureus. Using restriction enzymes and DNA ligases, she cuts and joins together fragments of the DNA derived from the two organisms, hoping that the lac gene of E. coli will recombine with the PC resistance gene of S. aureus. She uses a process of artificial transformation to insert (transform) the DNA fragments into a strain of E. coli which is penicillin-sensitive (PCs) and lactose negative (Lac-). What medium should she plate the transformants on in order to select for penicillin-resistant, lactose positive recombinant

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 answer to you question is   jet streams

thats not even an aswer choice

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.