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Movement of cell against concentration gradient is called

  • A.Osmosis
  • B.Active transport
  • C.Diffusion
  • D.Passive transport

Answer: B

Movement against a concentration gradient is active transport.

It moves a substance from low concentration to high, so it needs energy, supplied by ATP through carrier proteins. The sodium-potassium pump in every animal cell is the standard example. Osmosis and diffusion both run down the gradient and need no energy.

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