Q. 22

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

Answer :

The type of molecular movement which is highly selective and requires special membrane proteins but does not require energy is passive diffusion.

Facilitated diffusion facilitates movement of molecules or ions which are larger in size, polar or charged to move across a cell membrane which is selectively permeable. It uses membrane proteins like carrier and channel proteins for facilitating the movement of the substances along the concentration gradient.


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