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Galactose is concentrated in a cell by a transporter driven by ATP hydrolysis. What is the ratio of ADP to ATP required to maintain a galactose concentration gradient of 100,000:1. Assume the efficiency of energy use is 40% and that the concentration of Pi is 10 mM. T= 298oK., R = 8.3 J/mol. Show all work and clearly describe your logic.

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