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Energy-requiring process that moves material across a cell membrane against a concentration difference.
Adenosine Triphosphate (ATP)
The major energy currency of the cell, providing the energy for most of the energy-consuming activities of the cell.
The theory that cells form the fundamental structural and functional units of all living organisms.
Strengthening the concentration (as of a solute in a mixture) by removing extraneous material.
Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated.
Cell organelle that creates a network of membranes found through the whole cell.
Movement of specific molecules across cell membranes through protein channels.
A net-like structure in the cytoplasm of animal cells (especially in those cells that produce secretions).
A pliable sheet of tissue that covers or lines or connects organs or cells of animals that allow substances to move in and/or out of the cell.
Solid rod of protein, thinner than a microtubule, that enables a cell to move or change shape.
Straight, hollow tube of proteins that gives rigidity, shape, and organization to a cell.
A type of cell lacking a membrane-enclosed nucleus and membrane-enclosed organelles; found only in the domains Bacteria and Archaea.
A property of cell membranes that allows some substances to pass through, while others cannot.
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