Which of these statements about facilitated diffusion across a membrane is true?

Question

Which of these statements about facilitated diffusion across a membrane is true? a. It can increase the concentration gradient of the diffusing molecule. b. It can be slowed if the transported molecule is soluble in the nonpolar interior of the lipid bilayer. c. It is responsible for the transport of gases like O2 and CO2 across membranes. d. A membrane protein lowers the activation energy for movement of the molecule through the membrane. e. The process can not be saturated by the transported substance.

Explanation / Answer

correct answer is d. A membrane protein lowers the activation energy for movement of the molecule through the membrane.

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