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Question

Which of the following criteria does not pertain to facilitated diffusion?


A
High selectivity
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B
Transport saturation
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C
uphill transport
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D
Requirement of special membrane proteins
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Solution

The correct option is C uphill transport
Facilitated transport is across the plasma membrane with the aid of carrier proteins. The process is highly selective, as each ion has a specific carrier protein and hence they are subject to saturation when all the carriers are occupied.
Although facilitated by carrier proteins, this process is still energy conducive because the transport occurs from the region of high concentration to low concentration. And there is no uphill transport.

Biology

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