Active Transport

Active Transport

Cells take in substances by active transport. Active transport is an energy-consuming process by which substances are transported against their concentration gradient.In the cell membrane of the root hair cells are special carrier proteins. Carrier proteins pick up nitrate ions from outside the cell, and then change shape in such a way that they push the nitrate ions through the cell membrane and into the cytoplasm of the cell.Active transport uses energy. The energy is provided by respiration inside the root hair cells. Energy is needed to produce the shape change in the carrier protein. 

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