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State whether the following is true or false.
Facilitated diffusion requires ATP because it involves a membrane protein.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: B

The protein provides a route, not a push, so the movement is still driven by the concentration gradient alone. Requiring a protein and requiring metabolic energy are quite separate matters, and only active transport needs both of them together.

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