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Terms 3.3 & 3.5

Bio

QuestionAnswer
Cell membrane Forms a boundary between a cell and the outside environment and controls the passage of materials into and outside of the cells
phospholipid a molecule composed of a charged phosphate group, glycerol, and two fatty acid chains
fluid mosaic model describes the arrangement of the molecules that make up a cell membrane
selective permeability it allows some but not all materials to cross
receptor a protein that detects a signal molecule and preforms an action in response
Passive transport the movement of molecules across a cell membrane without energy input from the cell
diffusion the movement of molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.
concentration gradient the difference in the concetration of a substance from one location to another
osmosis move across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration
isotonic solute concentration equal to solute concentration inside a cell
hypertonic a solute concentration higher than the concentration inside a cell.
hypotonic solute concentration lower than the solute concentrate in a cell.
facilitated diffusion the diffusion of molecules across membrane through transport proteins
active transport drives molecules across a membrane from a region of a lower concentration to a region of higher concentration
endocytosis the process of taking liquids or fairly large molecules into a cell by engulfing them in a membrane
phagocytosis a type of endocytosis in which the cell membrane engulfs large particles
exocytosis the opposite of endocytosis is the release of substances out of a cell by the fusion of a vesicle with the membrane.
Created by: astei
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