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Biology 1A03 Chapter 6 Questions.docx

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McMaster University
Lovaye Kajiura

Biology 1A03- Chapter 6 Questions 8. The differences between simple diffusion and osmosis are: Simple Diffusion Osmosis  Molecules in a beaker diffuse freely  Osmosis deals with water moving across a bilayer. along its concentration gradient; from  Solutes diffuse across the membrane; lower to higher concentration. each undergoes a net movement along  Osmosis is a special case of diffusion. its own concentration gradient.  Start with more solute on one side  Equilibrium is established. than the other; using molecules that  Solutes continue to move back and cannot cross the selectively permeable forth across the membrane but at membrane. equal rates.  Dilutes the side of higher  Does not require a membrane concentration.  HIGH concentration to LOW  From a LESS concentrated solution to a concentration. DOWN A MORE concentrated solution. CONCENTRATION GRADIENT. 9. The differences between simple diffusion and facilitated diffusion: Simple Diffusion Facilitated Diffusion  Diffusion occurs from an area of HIGH  Is assisted by a specific TRANSPORT concentration to LOW concentration. PROTEIN  This diffusion occurs without the  Concentration gradient dependent. assistance of any intermediary  Some molecules and ions such as molecule (protein). glucose, sodium ions and chloride ions  Molecules diffuse freely across a are unable to pass through the lipid phospholipid bilayer. bilayer of cell membranes. 10. The differences between a hypertonic solution and a hypotonic solution are: Hypertonic solution Hypotonic solution  A solution with a greater solute  A solution with a lower solute concentration than that inside the cell. concentration than that inside the cell.  If the solution outside the membrane  If the solution outside the membrane has a higher of solutes than the interior has a lower concentration of solutes has, and the solutes are not able to than the interior has, water will move pass through the lipid bilayer, then into the vesicle via osmosis. The water will move out of the vesicle into incoming water will cause the vesicle the solution outside. to swell or burst. 11. The differences between the Davson-Danielli Sandwich model and the Singer-Nicholson Fluid Mosaic model are: Sandwich model Fluid Mosaic model  Structured like a sandwich, with  The discovery of amp
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