Cell - Basic unit of structure and organization of all living organisms., Cell Theory - States that (1) organisms are made of one or more cells; (2) cells are the basic unit of life; and (3) all cells come only from other cells., Plasma Membrane - Flexible, selectively permeable boundary that helps control what enters and leaves the cell., Organelle - Specialized internal cell structure that carries out specific cell functions such as protein synthesis and energy transformation., Eukaryotic Cells - Unicellular organism with membrane-bound nucleus and organelles; generally larger and more complex than a prokaryotic cell., Nucleus - A central organelle that contains the cell's genetic material in the form of DNA., Prokaryotic Cells - Cells without a nucleus or other membrane-bound organelles., Phospholipid Bilayer - Two layers of phospholipids are arranged tail-to-tail, the plasma membrane is composted of this., Transport Proteins - Protein that moves substances or wastes through the plasma membrane., Fluid Mosaic Model - A plasma membrane with components constantly in motion, sliding past one another within the lipid bilayer., Selective Permeability - Property of the plasma membrane that allows it to control movement of substances into or out of the cell., Diffusion - Net movement of particles from an area of higher concentration to an area of lower concentration., Dynamic Equilibruim - Condition of continuous, random movement of particles but no overall change in concentration of materials., Facilitated Diffusion - Passive transport of ions and small molecules across the plasma membrane by transport proteins., Osmosis - Diffusion of water across a selectively permeable membrane., Isotonic Solution - A solution with the same concentration of water and solutes as inside a cell, resulting in the cell retaining its normal shape because there is no net movement of water., Hypotonic Solution - A solution that has a lower concentration of solute outside than inside the cell, causing water to flow into the cell by osmosis., Hypertonic Solution - A solution that has a higher concentration of solute outside than inside a cell, causing water to leave the cell by osmosis., Active Transport - Energy-requiring process by which substances move across the plasma membrane against a concentration gradient., Endocytosis - Energy-requiring process by which large substances from the outside environment can enter a cell., Exocytosis - Energy-requiring process by which a cell expels wastes and secretes substances at the plasma membrane.,

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