How do we use energy to move particles from a low to high concentration?
Specifically in things like a root hair cell and in the small intestine when absorbing food molecules.
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The sodium-potassium pump is the classic example of active molecular transport across a membrane. The hydrolysis of ATP induces conformational changes in the transporter protein, which move the molecules across the membrane. More information on the [Wikipedia page](https://en.m.wikipedia.org/wiki/Sodium%E2%80%93potassium_pump)
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