NEET Biology question

Not in NEET syllabus

The rate of diffusion of a substance along the concentration gradient does not increase continuously as the concentration difference of the molecule across the membrane increases. Why?

(A)Process of facilitated diffusion needs ATP
(B)As concentration difference increases, molecules interfere with one another
(C)100% saturation of carrier protein occurs after some timeCorrect
(D)Transport proteins must be of the channel-protein type

Answer: (C)

Solution

In carrier-mediated facilitated diffusion, there is a finite number of carrier proteins available; once all of them are occupied (saturated) by

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Question ID VK-127653