Saturday 20 August 2011

Bio 10: Active Transport

1. Active transport is the movement of substances across the plasma membrane from a region of low concentration to a region of high concentrstion.

2. In active transport, the substances move across a membrane against the concentration gradient. This tramsport requires work, therefore the cell must expand its own metabolic energy.

3. The active transport of substances against the concentration gradient is performed by specific protein molecules embedded in the plasma membrane.

4. The transport protein which function as carrier proteins require energy to change the shape of the protein such that the substance can be pumped across the membrane.

5.The energy required for active transport is supplied by ATP (Adenosine Triphosphate)

6.All living cells can carry out active transport.

7.An example of active transport is the pumping of sodium ions (Na+) out of the cell.

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