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Module 3 Exam

Module 3 Exam Practice

TermDefinition
phospholipid bilayer structure of the plasma membrane that consists of two phospholipid (fat) layers arranged "tail to tail" with cholesterol and floating proteins scattered among them
active transport net movement of a substance across a membrane against a concentration or electrical gradient; requires release and use of cellular energy
passive transport type of membrane transport that does not require energy to move
simple diffusion unassisted diffusion of solutes through the plasma membraneprovides passage for certain needed substances
facilitated diffusion provides passage for certain needed substances
intracellular inside the cell
extracellular outside the cell
hypertonic a solution containing more solutes than there are inside the cells
hypotonic a solution containing less solutes than there are inside the cells
isotonic relating to a solution having the same osmotic pressure as cells
dynamic equilibrium water is still moving in and out continuously but the net movement is zero
osmosis diffusion of water through the plasma membrane
selective permeability a barrier that allows some substances to pass through while excluding others
concentration gradient difference in amount of a substance between two areas
hydrophilic water loving
hydrophobic water fearing
solute pump protein carrier involved in active transport
solution homogeneous mixture of two or more components
solvent the larger amount of substance in a solution; the water
solute the smaller amount of substance in a solution; the salt
vesicular transport involves help from ATP to move molecules between different parts of a cell within vesicles
endocytosis means by which fairly large extracellular molecules or particle enter cells
exocytosis process where vesicles fuse with the plasma membrane and release their contents to the cell's exterior
phagocytosis "cell eating;" engulfing large particles
pinocytosis cell drinking (liquids)
Created by: joslyn1
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