First slide

Means of Transport

Question

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

Easy

A

Transport saturation
B

Uphill transport
C

Requirement of special membrane proteins
D

High selectivity.

Solution

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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