You do a gram stain of an unknown bacterium and the teacher guarantees you that is it a member of family enterobacteriaceae. however, your cells come out purple. what other clue might indicate that you do have a member of that family of bacteria?
a. tiny cocci bacilli in chains
b. tiny bacilli
c. rod-shaped cells with endospores
d. curved rods.

The correct answer is c.  rod-shaped cells with endospores

Explanation:

Most members of family Enterobacteriaceae can appear pink after gram staining due to porous membrane like Zymophilus, Pectinatus etc. Most of them form endospores which is a very tough outer covering formed by cells to resist the adverse condition. Many members of these family resides in intestine of animals and helps in food digestion.

These bacteria comes under phylum Firmicutes and mostly are rod shaped(bacillus). So when most of cells comes out purple the rod shaped cells with endospores indicates that gram stain contains the member of family Enterobacteriaceae.

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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