Give an example of active transport. Explain what occurs during this process, including the type of substances that is being transported, the concentration gradient, and any structures in the cell membrane or within the cell that are used.

Carrier proteins pick up specific molecules and take them through the cell membrane against the concentration gradient. Examples of active transport include: uptake of glucose by epithelial cells in the villi of the small intestine. uptake of ions from soil water by root hair cells in plants.

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