Bacteria have a membrane potential, although the mechanisms of how it is maintained differ from those of mammalian cells. The transport of protons across the cell membrane is an important part of the mechanism, so a bacterium's membrane potential varies with the proton concentration-the pH-of the surrounding fluid. One strain of bacteria was found to have a membrane potential of -120 mV at a pH of 7.5. A bacterium can be modeled as a 1.5-um-diameter sphere Part A How many positive ions are needed on the exterior surface to establish this membrane potential? (There are an equal number of negative ions on the interior surface.) Assume that the membrane properties are the same as those of mammalian cells. ΣΕ ΑΣΦΑ N= ions Submit Request Answer

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