1406 TEST 2 Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
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
Popular Biology sets