In Facilitated Diffusion, the Diffusion Rate of a Specific Molecule

question 4

Multiple Choice

In facilitated diffusion, the diffusion rate of a specific molecule across a membrane does not continue to increase as the molecule's concentration difference across the membrane increases beyond a certain point.The reason is that

• A) facilitated diffusion requires the use of ATP.
• B) as the concentration difference increases, molecules interfere with one another.
• C) the carrier proteins become saturated.
• D) the transport protein is a channel protein.
• E) the diffusion constant depends on the concentration difference.

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