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Unlike active transport, passive and facilitated diffusion do not require

  • A.metabolic energy
  • B.concentration of solute against an electrochemical gradient
  • C.accumulation of solute against an electrochemical gradient
  • D.all of these

Answer: A

Correct answer: all of these

Passive and facilitated diffusion both move solute down its electrochemical gradient, so they need none of the three: no metabolic energy, and no ability to concentrate or accumulate solute against a gradient. Facilitated diffusion differs from simple diffusion only in using a carrier protein, which makes it faster and specific but no less passive. Doing any of these things is what defines active transport.

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