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Ch.4 Cell Membrane
Stanfield Cell Membrane Transport
| Question | Answer |
|---|---|
| For a substance crossing a cell membrane, the chemical driving force depends __________. | Only on the concentration gradient, regardless if the substance is an ion or not. |
| Which is in greater concentration inside the cell vs outside the cell? | Potassium ions and proteins |
| An example of primary active transport: | Transport of CALCIUM up an electro-chemical gradient by a protein that hydrolyzes ATP |
| If a certain anion is located in greater concentration inside the cell and a negative membrane potential exists, then the following statement is true: | The equilibrium potential for the anion is a positive value. |
| The osmotic pressure of a solution depends on: | The concentrations of all solute particles contained in it. |
| Movement of Na+ in sodium-linked glucose transport, in sodium-proton exchange, and via the sodium-potassium pump are all examples of: | Mediated transport |
| Molecules that would most likely cross the lipid bilayer by simple diffusion: | a small NONPOLAR molecule |
| Assuming that a substance is uncharged and is transported across a membrane by carriers, the net flux of that substance will tend to increase as______________________ | the number of carriers in the membrane increases |
| What do pumps and carriers have in common? | They are molecule specific |
| A leukocyte, a type of wbc, fights bacterial infections by sending out projections of its plasma membrane that surround an invading bacterium. The membrane then fuses together, entrapping the bacterium in a vesicle inside the cell. This is an example of: | Phagocytosis |
| Transport mechanisms that bring a specific extracellular substance into the cell: | Phagocytosis and receptor-mediated endocytosis |
| Substances the cross cell membranes by simple diffusion are mostly: | Hydrophobic |
| A channel carries out active or passive solute transport? | Passive |
| In simple diffusion, an uncharged solute always flows from a region of higher concentration to a region of lower concentration. T/F | True |
| In facilitated diffusion, passive flow of an uncharged solute always goes from higher to lower concentration. T/F | True |
| A concentration gradient is also referred to as a ____________ driving force. | Chemical |
| When a membrane potential is positive, there is an excess of cations over anions inside the cell. T/F | True--Cations (+), Anion (-) |
| A cell will shrink in hypertonic solution. T/F | True |
| When water diffuses across a membrane, it normally flows from a region of higher osmotic pressure to a region of lower osmotic pressure. T/F | False |
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n2biology
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