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Chapter 7
Membrane Structure & Function BSC1010
| Question | Answer |
|---|---|
| The term for membranes which allow some molecules to pass through while blocking passage of other molecules. | Selective Permeability |
| Another name for passive transport. | Facilitated Diffusion |
| Equal solute concentrations. | isotonic |
| When the solute concentration is less. | Hypotonic |
| Small sacs (circles) of membrane are called _______. | vesicles |
| This is the diffusion of water. | Osmosis |
| Which region of the phospholipid molecule is hydrophyllic? | The Glycerol Head |
| Is it the proteins or the fatty acid tails which are responsible for giving the "Fluid Mosaic Model" of the plasma membrane its MOSAIC portion of the name? | The insertion of the proteins. |
| A cell with an internal salt concentration of 0.1% salt is placed in a solution of 2% salt solution. Is the solution surrounding the cell considered hypotonic or hypertonic? | The solution surrounding the cell is considered hypertonic . |
| Does diffusion move molecules down or up the concentration gradient? | Down |
| The process a cell uses to bring particles into the cell by pinching off a small circle of membrane to form a vesicle enclosing the particles. | Endocytosis |
| In a solution consisting of salt dissolved in water, which is the solute? | salt |
| Which region of the phospholipid molecule is hydrophobic? | Fatty Acid Tails |
| When the solute concentration is greater. | Hypertonic |
| This method of moving molecules across the membrane uses proteins embedded in the membrane, and uses ATP energy to move molecules against (up) the concentration gradient. | Active Transport |
| A cell with an internal salt concentration of 0.1% salt is placed in a solution of 2% salt solution. Which way will water move, into or out of the cell? | Out of the cell. |
| This method of moving molecules across the membrane uses proteins embedded in the membrane, but does not use ATP energy. It also moves molecules down the concentration gradient. | Passive Transport |
| Is the glycerol head of a phospholipid molecule polar or non-polar? | Polar |
| The process whereby vesicles fuse with the plasma membrane and are able to "dump" the contents to the outside of the cell. | Exocytosis |
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mikec35-pbsc
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