THE CARRIER HYPOTHESIS: PASSIVE, FACILITATED DIFFUSION

• MEMBRANE PROTEINS ASSOCIATE WITH LIGANDS AT THE CELL SURFACE

• THE PROTEIN SURROUNDS THE LIGAND WITH HYDROPHOBIC SIDE GROUPS

• THE COMPLEX MOVES TO THE OTHER SIDE OF THE MEMBRANE

• THE LIGAND IS RELEASED

• THE PROTEIN MOVES BACK TO PICK UP ANOTHER LIGAND MOLECULE

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