Base Your Answers to the Questions Below on the Following

question 25

Multiple Choice

Base your answers to the questions below on the following information:
A cell biologist interested in the transport of calcium ions (Ca2+) across the plasma membrane of bacterial cells made the following measurements on bacterial cells at 25°C:
Vm = - 150 mV [Ca2+] inside = 20 mM [Ca2+] outside = 0.4 mM
-Assuming no change in either the internal or external calcium ion concentration, at what membrane potential would there be no net movement of calcium across the membrane?

• A)0 mV
• B)+50 mV
• C)+25 mV
• D)- 50 mV
• E)- 25 mV

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