Biomembranes I:
Membrane Structure and Transport
Concept 5: Mechanisms of Active
Transport
Active transport can occur as a
direct result of ATP hydrolysis (ATP pump) or by coupling the
movement of one substance with that of another (symport or
antiport).
![](images/spacer.gif)
![](images/Activetr.gif)
Active transport may move solutes
into the cell or out of the cell, but energy is always used to move
the solute against its concentration gradient.
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