active transport
- Created by: Sophie Gibbons
- Created on: 06-01-13 15:02
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- Active transport
- The movement of molecules in or out of a cell from a region of low concentration to high concentration using energy and carrier molecules.
- Requires ATP
- Works against its concentration gradient.
- Carrier proteins act as pumps.
- ATP can be used to directly move molecules or during co-transport.
- Carrier proteins span length of bilayer.
- Molecules bind to receptors on the channel of carrier proteins.
- ATP binds and splits into ADP and a phosphate molecule.
- Protein molecule changes shape releasing the molecules on the other side of the membrane.
- Phosphate molecule rejoins with ADP to form ATP causing the protein to change to its original shape.
- Protein molecule changes shape releasing the molecules on the other side of the membrane.
- ATP binds and splits into ADP and a phosphate molecule.
- Molecules bind to receptors on the channel of carrier proteins.
- Sodium potassium pump
- One molecule is moved out of a cell while another is moved in at the same time.
- Sodium ions are removed from the cell while potassium molecules are taken in.
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