Rosalind franklin is famous for which contribution to the study of dna?
creation of an accurate model of dna structure
creation of an x-ray diffraction image of dna structure
identification of a pattern in ratios of dna bases
identification of dna in bandages that contained pus

The correct answer is Creation of an X-ray diffraction image of DNA structure.

Rosalind Franklin is famous for the creation of the X-ray diffraction image of DNA structure. Photo 51 was given a nickname to the diffraction image of the crystallized DNA molecule. This gave a significant evidence for the discovery of the double helical structure of the DNA.

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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