Which Statement About Facilitated Diffusion Across a Membrane Is TRUE

Which statement about facilitated diffusion across a membrane is TRUE?

A) A specific membrane protein lowers the activation energy for movement of the solute through the membrane.
B) It can increase the size of a transmembrane concentration gradient of the diffusing solute.
C) It is impeded by the solubility of the transported solute in the nonpolar interior of the lipid bilayer.
D) It is responsible for the transport of gases such as O₂, N₂, and CH₄ across biological membranes.
E) The rate is not saturable by the transported substrate.

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