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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

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

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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Part A Bacteria have a membrane potential, although the mechanisms of how it is maintained diffor from those of mammalian cells. The transport of protons across the cell membrane is an important part of the machanism, 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. How many positive ions are needed on the exxterior surtace to establish this membrane potential? (There are an equal number of negative ions on the interior surface.) Assume that the mombrane propertios are the same an those of mammalian cells, lons Submit Request Answer
Transcribed Image Text:Part A Bacteria have a membrane potential, although the mechanisms of how it is maintained diffor from those of mammalian cells. The transport of protons across the cell membrane is an important part of the machanism, 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. How many positive ions are needed on the exxterior surtace to establish this membrane potential? (There are an equal number of negative ions on the interior surface.) Assume that the mombrane propertios are the same an those of mammalian cells, lons Submit Request Answer
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