Final answer:
All cell types listed typically have a Na+/K+ pump on the basolateral membrane for active transport. Without specific information to the contrary, we cannot definitively conclude that one of the cell types does not have the pump. Thus, a definitive answer cannot be provided based on the given information.
Step-by-step explanation:
The question concerns which of the given cell types does not have a Na+/K+ pump on the basolateral membrane. Na+/K+ ATPase is an essential pump in animal cells that maintains the electrochemical gradient by actively transporting sodium out of the cell and potassium into the cell. Stomach parietal epithelial cells, proximal tubule epithelial cells, ascending limb epithelial cells, and small intestine epithelial cells all have Na+/K+ pumps on their basolateral membranes, as these are involved in the active transport of nutrients and ions.
However, distal tubule epithelial cells, although having the function of pumping ions against their concentration gradient, the specifics of their ion transport mechanisms and the expression of Na+/K+ pumps may vary. In the context given, if one of these cells types were to not have a Na+/K+ pump on the basolateral membrane, it is not explicitly detailed in the provided information. Therefore, a definite answer to the question cannot be provided based on the provided excerpts alone.