Transport proteins are the biological gatekeepers of the cell. They are specialized proteins embedded within the lipid bilayer of cell membranes, acting as sophisticated tunnels, pumps, and carriers. Their primary role is to move ions, small molecules, and macromolecules across biological membranes that would otherwise be impermeable to such substances. Because the cell membrane is hydrophobic, polar or charged molecules like water, glucose, and sodium cannot simply diffuse through it. Without transport proteins, cells would be unable to absorb nutrients, expel waste, or maintain the electrochemical gradients necessary for life.
Think of channel proteins as or pores . They form a hydrophilic (water-loving) pathway straight through the membrane. function of transport protein
The primary functions of transport proteins include: Transport proteins are the biological gatekeepers of the