The pump proteins rearranged themselves, effectively flipping inside out. The vesicle fused with the membrane, spitting the large protein molecule out into the bloodstream.
"Glucose," I said, spotting a six-carbon ring looking dejected. "The cytoplasm already has a high concentration of it, but the cell is greedy. It wants more." what type of molecules are transported by molecular pumps
"And the one thing they all had in common? They couldn't walk through the door themselves. They needed energy—my energy—to make the trip. That’s the definition of a molecular pump." The pump proteins rearranged themselves