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Q.

Which of the following criteria is not pertained to facilitated transport ?

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a

Transport saturation

b

Uphill transport

c

Requirement of special membrane proteins

d

High selectivity.

answer is B.

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Detailed Solution

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Characteristics of facilitated diffusion are:

  • Towards concentration gradient (downhill)
  • No input of energy
  • Membrane proteins involved; therefore, very specific
  • Show saturation effect
  • Sensitive to inhibitors which react with protein side chains

Note: A concentration gradient must already be present for molecules to diffuse even if facilitated by the proteins. 

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