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Biology Ch.3

Biology Ch. 3

TermDefinition
cell theory All organisms are made of cells; All existing cells are produced by other living cells; The cell is the most basic unit of life.
cytoplasm A jellylike fluid that fills the inside of a cell.
organelle Structures specialized to perform distinct processes within a cell.
prokaryotic cell A cell without a nucleus or other membrane-bound organelles.
eukaryotic cell A cell with a nucleus and other membrane-bound organelles
cell membrane Double-layer of phospholipids that forms a boundary between a cell and the surrounding environment and controls the passage of materials into and out of a cell.
fluid mosaic model Model that describes the arrangement and movement of the molecules that make up a cell membrane.
selective permeability Condition or quality of allowing some, but not all, materials to cross a barrier or membrane
diffusion Movement of dissolved molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.
concentration gradient Difference in the concentration of a substance from one location to another
osmosis Diffusion of water molecules across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration.
isotonic Solution that has an equal concentration of dissolved particles compared with another solution.
hypertonic Solution that has a higher concentration of dissolved particles compared with another solution.
hypotonic Solution that has a lower concentration of dissolved particles compared with another solution.
active transport Energy-requiring movement of molecules across a membrane from a region of lower concentration to a region of higher concentration.
Created by: Mr.Devine
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