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In living system, facilitated transport
Solution:
Facilitated transport is a type of passive transport, meaning it occurs down the concentration gradient and does not require metabolic energy in the form of ATP. However, it does require specific membrane proteins (carrier or channel proteins) to facilitate the movement of substances across the cell membrane. These proteins are selective, meaning they bind to and transport specific molecules, and because there is a finite number of these proteins, the transport process can become saturated at high substrate concentrations.