click below
click below
Normal Size Small Size show me how
BI Lab 5
Term | Definition |
---|---|
plasma membrane | physical barrier that separates the cell interior from the environment and regulates substances passing into or out of the cell |
lipids and fats | main components of the plasma membrane and of cell organelle membranes |
bilayer | lipid molecules form a ________ with protein molecules of various types distributed throughout the lipid bilayer |
diffusion | the process by which molecules move about by inherent random motion and become evenly mixed or dispersed |
equilibrium | exists when the molecules become uniformly distributed |
concentration gradient | exists when molecules are not evenly distributed |
temperature, pressure, concentration, and molecule size | variables that affect diffusion |
selectively permeable | some substances pass through more readily than others |
impermeable | completely prevents the passage of those molecules into or out of the cell |
dialysis | the diffusion of a dissolved solute through a selectively permeable membrane |
osmosis | diffusion of water through a selectively permeable membrane |
solutes | particles in a solution |
isotonic (iso=same) | two solutions that have the same concentrations of solutes |
hypertonic (hyper=higher) | solution contains a higher concentration of solutes than another solution |
hypotonic (hypo=lower) | solution contains a lower concentration of solutes in comparison to another solution |
monosaccharide | one sugar |
polysaccharide | large molecule composed of many sugars |
vacuole | surrounded by the vacuolar membrane |
vacuolar membrane | is selectively permeable |
turgor pressure | presses the cytoplasm against the cell wall |
turgid | cells with turgor pressure |
plasmolysis | the shrinkage of the cytoplasm away from the cell wall |