In biology, is the process by which cells move molecules across their membrane against their concentration gradient—from an area of low concentration to an area of high concentration. Because this is an "uphill" movement that defies natural diffusion, it requires energy, typically in the form of ATP (adenosine triphosphate).
While not always classified as "molecular" active transport, is another energy-requiring method for moving large amounts of material or large particles across the cell membrane. It uses vesicles (small membrane sacs). kinds of active transport
: The cell membrane folds inward to form a pocket, engulfing external material and bringing it inside. In biology, is the process by which cells
Materials are moved . The plasma membrane folds inward (invaginates) to form a vesicle around the substance. It uses vesicles (small membrane sacs)
This pump is found in nearly all animal cells. For each ATP molecule consumed, it moves: