A membrane protein (co-transporter) couples the movement of one molecule down its gradient (releasing energy) with the movement of a different molecule against its gradient (using that energy).
Here is the breakdown of the two systems. The Energy Source: It uses energy directly from a chemical reaction, typically the hydrolysis of ATP (adenosine triphosphate). A membrane protein (co-transporter) couples the movement of
A membrane protein acts as a pump. It binds to a molecule on one side of the membrane, breaks an ATP molecule to release energy, changes shape, and releases the molecule on the other side. A membrane protein acts as a pump
Cells must constantly move molecules against their concentration gradient (from low to high concentration). This process requires energy and is called active transport . However, not all active transport is the same. The key distinction lies in where that energy comes from . This process requires energy and is called active transport