What makes a dialysis tube suitable for studying diffusion? Select all that apply.
The solution has more solute | The cell has more solute | The cell and solution are the same | |
|---|---|---|---|
Hypotonic solution | |||
Hypertonic solution | |||
Isotonic solution |
What happens to our cells when we drink too much salt water?
What is the process that occurs when a cell shrinks due to an extreme amount of salt?
Back to the experiment: Use image to answer the questions below.
Beaker | Tube | |
|---|---|---|
Which is more concentrated in starch? | ||
Which is more concentrated in iodine? | ||
With regard to iodine, which is hypertonic? | ||
With regard to starch, which is hypertonic? |
Make Predictions about which substance will move:
Into Beaker | Into Tube | |
|---|---|---|
If the tube is permeable to starch, which way would the starch move? | ||
If the tube is permeable to iodine, which way would the iodine move? |
Make Predictions about which substance will move:
Orange | Purple | No Change | |
|---|---|---|---|
If the tube is permeable to iodine, what color would you expect the contents to change? | |||
If the tube is permeable to iodine.. what about the solution in the beaker? | |||
If the tube is permeable to starch, what color would you expect it to change? | |||
If the tube is permeable to starch, what about the solution in the beaker? |
What is observed when a dialysis tube filled with a starch solution is placed in a beaker with an iodine solution? Select all that apply.
Image taken after five minutes
Clear/white | yellow | dark purple | |
|---|---|---|---|
Solution in Beaker before 5 minutes | |||
Solution in Tube before 5 minutes |
Image taken after five minutes
Clear/white | yellow | dark purple | |
|---|---|---|---|
Solution in Beaker after five minutes. | |||
Solution in Tube after five minutes. |
Based on your observations, which substance moved, the iodine or the starch?
The dialysis tube was permeable to which substance?
Lab Summary - Explain how this experiment models a cell membrane. Use the following terms in your explanation: selectively permeable, hypertonic, diffusion, indicator. Review rubric prior to responding.
What principle is demonstrated in this lab? Select all that apply.
What is the indicator of starch when mixed with iodine?
If a substance turns into a blue-black color when in contact with iodine, what does this indicate?
