The active transport pump used to move sodium ions across the membranes of gill cells in a freshwater fish has each of the following characteristics EXCEPT

IT USES OSMOSIS TO CARRY SODIUM IONS INTO THE CELL.

The active transport pump that is used to move sodium ions across the cell membranes of gill cells in freshwater fish has the characteristics of active transport system except that it uses osmosis to carry sodium ion into the cell.

During the process of active transport, there is use of energy by a protein pump in the form of ATP,this protein pump is to move molecules from an area of low concentration to an area of high concentration.

A good example of this active transport system is the sodium-potassium pump,this sodium-potassium pump moves sodium ion to the outside of the cell and moves potassium ion to the inside of the cell.

So that rules out the option stated above because it uses osmosis to move sodium ions into the inside of the cell instead of moving it outside the cell.