Active Transport Differs from Facilitated Diffusion in That

Active transport differs from facilitated diffusion in that

A) ions are not transported via active transport, only by facilitated diffusion.
B) active transport requires a protein component, whereas facilitated diffusion occurs by simple diffusion through the plasma membrane.
C) active transport involves the transport of molecules up their concentration gradient.
D) active transport involves a conformational change in the transport molecule.

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