Active Transport

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ACTIVE TRANSPORT:

  • Direct active transport of a single molecule or ion:
    • The carrier proteins span the plasma membrane and bind to the molecule or ion to be transported on one side of it.
    • The molecule of ion binds to receptor sites on the carrier protein.
    • On the inside of the cell/organelle, ATP binds to the protein, causing it to split into ADP and a phosphate molecule. As a result the protein molecule changes shape and opens to the opposite side of the membrane.
    • The molecule or ion is then released to the other side of the membrane.
    • The phosphate molecule is released from the protein which causes the protein to revert to its original shape, ready for the process to be repeated. The phosphate molecule then recombines with the ADP…

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