Ncert Exercises & Solutions

Q.22 Identify a type of molecular movement which is highly selective and requires special membrane proteins, but does not require energy.

Facilitated diffusion’s is the mechanism which is highly selective passive process. In facilitated diffusion special proteins- help in movement of substances across the membrane without expenditure of ATP energy because facilitated diffusion cause net transport of molecules from a low to high concentration and this would not require input of energy.

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