Explain: Passive Symports and Antiports.

$ \Rightarrow $ Some carrier or transport proteins allow diffusion only if two types of molecules move together.
$ \Rightarrow $ Symport: In a symport, both molecules cross the membrane in the same direction.
$ \Rightarrow $ Antiport: In an antiport, molecules move in opposite directions.
$ \Rightarrow $ Uniport: When a molecule moves across a membrane independent of other molecules, the process is called uniport.