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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.
Quick Answer. Active transport is important for cellular function because it moves important items, such as calcium and glucose, into and out of cells. Proteins sit on the cell membrane, with one part inside and one part outside the membrane. If these items don't cross the membrane, the cell can die. Continue Reading