Question: The antibiotic Gramicidin A can transport Na+ ions into a certain cell at the rate of 5.0 x 10^7 Na+ ions channel^-1 s^-1. Calculate the time in seconds to transport enough Na+ ions to increase its concentration by 8.0 x 10^-3 M in a cell whose intracellular volume is 2.0 x 10^-10 mL