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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.
These molecules are produced through various processes including cellular respiration and phosphorylation. ATP molecules are called the drivers of cellular metabolism. They carry the energy needed by a particular cellular activity. Another important thing about this molecule is that it is recyclable.t is a molecule found in the cells of living organisms. It is said to be very important because it transports the energy necessary for all cellular metabolic activities. It is dubbed as the universal unit of energy for living organisms. Without ATP, various metabolic activities in the human body cannot take place.