In active transport,

  • A
    Energy is required
  • B
    Membrane proteins are involved
  • C
    Pumps are present
  • D
    All of these

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Transport against the concentration gradient is known as:

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Facilitated diffusion in cells is brought about by . . . . . . in the cell membrane.

Which of the following criteria does not pertain to facilitated transport?

Which of the following processes does not occur against the concentration gradient?

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