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Identify the process occurring in I, II and III.

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Ans. i) Uniport

When the movement of a single molecule takes place, through the carrier protein, without coupling with another molecule, the process is called uniport transport. Common examples include glucose transporters (e.g., GLUT1).

ii) Antiport

The type of facilitated diffusion that takes place through the carrier proteins, in which two types of molecules have to move together but in opposite directions is called antiport transport. Examples include the sodium-glucose cotransporter (SGLT) in intestinal cells.

 iii) Symport

The type of facilitated diffusion that takes place through the carrier proteins, in which two types of molecules have to move together in the same direction is called symport transport. An example is the sodium-potassium pump (Na?/K? ATPase), which maintains ion gradients.

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