The overall free energy change to transport one mol of K+1 ion from the outside of a cell (where its concentration is 4 mM) to the inside (where its concentration is 0.5 mM), is -13.08 kJ/mol. What is the trans membrane potential (at 37 Celsius)?
a. 50 mV inside negative
b. 60 mV inside negative
c. 70 mV inside negative
d. 80 mV inside negative
e. 190 mV inside negative