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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.
Active transport requires chemical energy because it is the movement of biochemicals from areas of lower concentration to areas of higher concentration. Passive transport moves biochemicals from areas of high concentration to areas of low concentration; so it does not require energy. What functions do carrier proteins perform in active transport? Carrier proteins allow molecule to bind to them; they change their shape to transport material across the cell membrane.