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1406 TEST 2


What happens to a freshwater organism when it is transfered to sea water? it's cells will shrink; crenate
What factors influence the rate of diffusion through a selectively permeable membrane? size of the molecules, temperature of the environment,concentration of the solutes
Diffusion of nonpolar molecules are not affected by __________________. charge
Type of diffusion that requires energy of ATP. active transport
Type of diffusion that does not require the energy of ATP. passive transport
Types of active transport. Na-K pump, endocytosis, exocytosis
Movement of molecules from an area of low concentration to an area of high concentration would require ___________ and is therefore _________________. ATP; active transport
Molecules moving down the concentration gradient from high concentration to low concentration does not require ____________ and is therefore _______________. ATP; passive transport
An environment that has a higher solute concentration and a lower water concentration than the cell hypertonic environment
An environment with a hight water concentrationa and a lower solute concentration than the cell. hypotonic environment
An environment that has the same concentration of solutes and the same concentration of water as the cell. isotonic environment
What happens to a plant cell placed in a hypertonic environment? contents shrink; plasmolysis
What happens to an animal cell placed in a hypertonic environment? it will shrink; crenate
What happens to a plant cell placed in a hypotonic environment? it will swell; turgid, stiff (not burst because of cell wall)
What happens to an animal cell placed in a hypotonic environment? it will swell and burst
Passive transport that requires the use of a transport protein to transport the molecule across the membrane. facilitated diffusion
The gradual change in solute concentration high to low concentration. concentration gradient
The movement of molecules against the concentration gradient would be _____________. active transport
The gradual spreading of molecules from an area of high concentration to an area of low concentration. diffusion
The diffusion of water molecules only. osmosis
Sodium-potassium pump is an example of ______. active transport
The engulfing of molecules too large to fit through the integral proteins. Why can't plant cells do this? phagocytosis; cell wall is to rigid
who proposed the "Fluid Mosaic Model" for the structure of cell membranes? Singer and Nicolson
the fluid mosaic model of cell membranes proposes what structure of membranes a phospholipid bilayer with embedded proteins
animal cell membranes have what types of molecules as structural components? phospholipids, proteins, and cholesterol
what property does cholesterol add to animal cells allows the membrane to be fluid like even at colder temperatures
a molecule that is both hydrophobic and hydrophilic amphipathic
how can a polar compound like proteins be embedded in a nonpolar membrane it must be amphipathic with both polar and nonpolar radicals in its tertiary structure
how can fatty acids in the phospholipid help keep the membranes more fluid than solid? double bond kinks spread the molecules out and keep them from packing together tightly; less dense
proteins that span the width of the membrane integral proteins
proteins limited to the outer or inner surface of the plasma membrane peripheral proteins
molecules that pass through a membrane easily small and hydrophobic
molecules that pass through a membrane the fastest gases; O2, CO2, etc.
water diffuses through proteins called aquaporin
what is the voltage across a membrane called? membrane potential
types of passive transport diffusion, osmosis, facilitated diffusion
carrier molecules of the membrane used in active transport proteins
what happens to a cell placed in sea water it shrivels (crenation) because sea water is hypertonic
plant cells placed in fresh water will become turgid from internal pressure caused by the gain of water
a solution has of 5% salt concentration is separated from a solution of 15% salt concentration by a membrane that is permeable to salt but not to salt......what will happen 5% side is hypotonic and water will move from the 5% side to the 15% side
Created by: hembreeb72