AMP-PNP is a non-hydrolyzable ATP analog that cannot be metabolized by cells. Taurocholate is a bile acid that helps emulsify fats. When taurocholate is added to hepatocyte cell culture, it accumulates in
those cells. The graph below shows the rate of cellular accumulation of the drug taurocholate in the
presence of either no ATP, ATP, or AMP-PNP. Based on this data, describe the mechanism by which
taurocholate enters the cell. Justify your answer.