The movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy from cellular respiration
Active transport
Occurs across a membrane
Requires special proteins in the membrane to transfer molecules
Energy for active transport
Comes from cellular respiration in mitochondria
ATP
Molecules that store energy from cellular respiration and transport it to different parts of the cell
Root hair cells
Cells in plant roots that absorb water and mineral ions from the soil
Root hair cells
Have a large surface area for absorption
Have many mitochondria to provide energy for active transport
Mineral ions needed by plants
Are at higher concentration inside root hair cells than in the soil, so require active transport to be absorbed
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