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Which of the following is true of passive transport?

  • A.it requires a gradient
  • B.it uses the cell wall
  • C.it includes endocytosis
  • D.it only moves water

Answer: A

Correct answer: it requires a gradient

Passive transport is driven by the concentration or electrochemical gradient and by nothing else - no ATP, no carrier necessarily - so it stops when the gradient is gone. Endocytosis is an active, energy-consuming process, and passive transport moves solutes as well as water.

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