Which of the following is not true for the carrier molecules involved in facilitated diffusion ?

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They increase the speed of transport across a membrane

They concentrate solute molecules on one side of the membrane

They have specific binding sites for molecules they transport

They may undergo conformational change upon binding of solutes

answer is B.

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Detailed Solution

Carrier proteins are trans membrane proteins that do not form pores in membrane but selectively bind to the solute at specific site on them. This causes conformational change in carrier protein which exposes to the solute to other side.

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