A molecule moves down its concentration gradient using a transport protein in the plasma membrane. This is an example of

a. active transport
b. facilitated diffusion
c. diffusion
d. exocytosis
e. endocytosis

Answer: b. facilitated diffusion

in facilitated diffusion, molecules use transport protein to move across the plasma membrane. there is a net movement of molecules down the concentration gradient -- that is, there is a net movement of molecules from where they are more concentrated to where they are less concentrated

Biology & Microbiology

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