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Facilitated diffusion differs from simple diffusion in that it

  • A.uses a channel or carrier protein
  • B.moves substances against the gradient
  • C.consumes ATP at every step
  • D.occurs only in prokaryotic cells

Answer: A

The protein provides a path for substances the lipid core would otherwise block, such as ions and glucose. It remains a passive process, since movement is still down the concentration gradient and no metabolic energy is spent by the cell.

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