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(January 2009). A membrane transport protein (or simply transporter) is a membrane protein involved in the movement of ions, small molecules, or macromolecules, such as another protein, across a biological membrane.January 2009). A membrane transport protein (or simply transporter) is a membrane protein involved in the movement of ions, small molecules, or macromolecules, such as another protein, across a biological membrane.
Anything soluble is transported by passive transport and particles like proteins, ions, large cells, sugars are transported by the process of active transport. Importance of active transport is, it includes diffusion of such particles which can not diffuse or which may diffuse very easily.