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.
Question 1
1.
Question 2
2.
Question 3
3.
Question 4
4.
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?
Water moves out of the cell
Water moves into the cells
Cells expand and burst
There is no impact on osmosis
What is the process that occurs when a cell shrinks due to an extreme amount of salt?
Plasmolysis
Cytolysis
Photosynthesis
Respiration
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.
Iodine solution remains the same
Starch solution changes color
Starch solution remains the same
Iodine solution changes color
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?
iodine
starch
The dialysis tube was permeable to which substance?
iodine
starch
What makes a dialysis tube suitable for studying diffusion? Select all that apply.
Its similarity to a cell membrane
Its durability
Its elasticity
Its semi-permeable nature
What principle is demonstrated in this lab? Select all that apply.
Gravity
Magnetism
Selective permeability
diffusion
What is the indicator of starch when mixed with iodine?
Yellow color
Red color
Blue-black color
Clear color
If a substance turns into a blue-black color when in contact with iodine, what does this indicate?