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diffusion: membrane
| Question | Answer |
|---|---|
| What is the best explanation for the color change that occurred inside the "cell"? | The iodine diffused into the "cell" and changed the starch to blue-black. |
| Did any starch diffuse out of the "cell"? Explain how you can tell. | No. The iodine didn't change color to blue-black. |
| Did any glucose diffuse out of the "cell"? Explain how you can tell. | Yes. When a sample of the liquid outside the "cell" was mixed with glucose indicator (Benedict Solution) and heated, it changed color to brick-red. |
| Which substance(s) diffused though the membrane? | Iodine (went in) & Glucose (went out), water also diffuses (but was not tested in lab 2) |
| Which substance(s) did not diffuse through the membrane? | startch |
| Explain why some substances were able to pass through the membrane while others were not able to. | Only some substances were able to pass through because the cell is semi-permeable and will only let certain substances pass through. The membrane will allow small particles to pass through, while large molecules, such as starch, cannot. |
| Describe the changes observed in the red onion cells after you added salt solution. | The cell membrane and its contents pulled away from the cell wall. |
| Describe what happens to the water content of the red onion cells when they are placed in a salt solution. | The water moved out of the cell (the vacuole inside the cells) causing the cells to decrease in volume. (salt sucks) |
| Describe the changes that occurred in the red onion cells after adding more water. | The cells got larger and the contents expanded as water diffused back into the cell. |
| Why the digestion of starch to glucose is necessary for life? | Starch is digested because its molecules are too large to diffuse across cell membranes. The starch wouldn't be able to diffuse from the intestine into blood and from blood into cells, Glucose is so small and soluble, so its able to diffuse. |
| What is the Glucose Indicator Solution and the Starch Indicator Solution and what are their original colors? | Glucose Indicator-Benedict Solution (blue) Starch Indicator-Iodine/Lugol's (amber) |
| Why do cells swell in distilled water? | has a water concentration that is less than the water concentration inside the cell; this causes the cell to swell. |
| Why do cells shrink in salt water? | has a water concentration that is less than the water concentration inside the cell; this causes the cell to lose water and dehydrate. |
| osmosis | the passage of water from an area where there is more water molecules to an area where there is less water molecules |
| How do we know when equilibrium of water molecules is reached? | water concentration outside the cell that is equal to the water concentration inside the cell. |
| diffusion | molecules moving from high to low concentration |
| active transport | the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy. |
| What is the difference between passive transport/diffusion and active transport | Passive goes from H->L concentration WITHOUT ATP, Active goes from L--> H concentration WITH ATP |
Created by:
olivia83
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