4.4 - active transport

• Active transport is the movement of a substance from a high concentration to a low concentration using metabolic energy and a carrier protein
• Active transport occurs through the carrier proteins
• During active transport, the molecule binds to the receptor that is complementary in shape on the protein. ATP then bonds to the carrier protein from the inside of the cell and it is hydrolysed into ADP + Pi — causing the carrier protein to change shape and release the molecule to the other side.
• Following active transport, the phosphate ion is released and the carrier protein returns to its original shape