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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.
Protein is key to such reactions as metabolism, DNA replication and molecule transportation. They are also key in making sure the human body reacts properly to stimuli. Proteins do not exist for extended periods of time, which is why they need to constantly be recreated and taken in as part of a balanced diet. The proteins eventually degrade or are exported out of the cells.