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Active Transport
Active transport allows cells to exchange molecules against a concentration gradient.

Metabolic energy is required for the process.

Once inside the cell the molecules are prevented from leaking back by the barrier of the cell-
surface membrane's bilayer.

In this way a different environment is maintained on either…

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Direct active transport of a single molecule or ion takes place as follows:

The carrier proteins span the cell-surface membrane and accept the molecules or
ions to be transported on one side of it

The molecules or ions bind to receptors on the channels of the carrier protein

On the…

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