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If a solute is moving through a phospholipid bilayer from an area of higher concentration to an area of lower concentration without the assistance of a protein, the manner of transport must be _______.

a. active transport
b. facilitated diffusion
c. simple diffusion
d. any of the above, depending on the solute
e. solutes cannot cross phospholipid bilayers.

User Jhurliman
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1 Answer

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C. simple diffusion.
User Mohit Bhardwaj
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