Carrier Mediated Transport

Front 1

Carrier-mediated transport mechanisms

Back 1

a solute binds to a specific binding site on a carrier protein (an integral membrane protein), and then is transported to the other side of the membrane when the carrier’s binding site is exposed to the opposite side of the membrane.

Front 2

carrier mediated transport mechanisms include: (3)

Back 2

1. Facilitated transport (facilitated diffusion)
2. Primary (1°) active transport, i.e. pumps that use ATP as an energy source
3. Secondary (2°) active transport, i.e., transporters that use the energy available in the
gradient of electrochemical potential across the membrane (Usually this is the Na+ gradient.)

Front 3

What happens in Carrier-Mediated Transport?

Back 3

1. A solute binds to a carrier’s binding site on one side of the membrane
2. Something happens to the carrier protein that causes this binding site to be exposed to
the other side of the membrane
3. The solute unbinds from the binding site and is now on the other side of the membrane.