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16 terms

Biology- Prentice Hall

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cell membrane
thin flexible barrier around a cell, regulates what enters and leaves a cell.
cell wall
strong supporting layer around the cell membrane in plants, algea and some bacteria
lipid bilayer
double layered sheet that forms the core of nearly all cell membranes
concentration
the mass of solute in a given volume of solution or mass/volume
diffusion
process by which molecules tend to move from an area where it is more concentrated to an area where is is less concentrated
equalibrium
when the concentration of a solute is the same throughout a solution
osmosis
diffusion of water through a selectively permeable membrane.
isotonic
when the contraction of 2 solutes is the same.
hypertonic
when comaring two solutions, the solution with the greater concentration of solutes
hypotonic
when comparing two solutions, the solution with the lesser concentration.
facilitated diffusion
movement of specific molecules across cell membranes through protein channels
active transport
energy-requiring process that moves material across the cell membrane against a concentration difference.
endocytosis
process by which a cell takes material into the cell by infolding of the cell membrane
phagocytosis
process in which extentions of cytoplasm surround and engulf large particles and take them into the cell
pinocytosis
process by which a cell a cell takes in liquid from the surrounding envirment
exocytosis
process by which a cell releases a large amount of material