Chloride ion (Cl-) concentrations must be maintained much higher outside of cells than inside of cells. How this gradient is maintained is complex, but a key transporter co-transports Cl- along with K+ ions. The name of this transport protein could be and its mode of transport would be

Explanation:

Such type of the integral membrane proteins that that plays important role in the transport of many ions or molecules across the membrane at a same in the same direction is called as symporters such as K+/Cl- symporter and some other. Such type of transport in which energy is required is called active transport. When energy is required in inward direction then called indirect active transport.