Solved by a verified expert:Cell Membrane Transport
Exercise 1 –
Diffusion through an Artificial Membrane
Table 1 – Changes during Dialysis
in Dialysis tubing
in Cup 1
Table 2 – Benedict’s test Results
#1 IKI solution from cup 1
#2 Dialysis bag solution from cup 2
#3 Distilled water
of the tubes #1, #2, or #3 is the control for this experiment?
color change did you observe inside the dialysis tubing? What does that change indicate?
3. Was there a color change in the water surrounding
the tubing? If so, explain.
color change(in the liquid) was observed in the water containing the IKI after
heating? What does that change indicate?
you notice any precipitate in the tubes after heating? If so, what color was it? Which tubes was it present in?
does the Benedict’s reagent detect?
does the IKI solution detect?
the transport mechanism observed here passive or active? Why?
Exercise 2 – Diffusion at
Data Table 3 – Diffusion of KMnO4 at
#1 Cold _______________
#2 Ambient ________________
#3 Hot ________________
State a general hypothesis to cover how temperature
affects rate of diffusion.
Did all of the solution in the tubes change color within
5 minutes? If so, which tubes?
If you had any tubes that did not change color within 5
minutes, how much longer would you speculate it would take to change colors? Explain your answer.
Do you think if the test tubes were larger and held more
water the results would be the same?
Explain your answer.
How does temperature affect the rate of diffusion?
Exercise 3 – Tonicity and Diffusion
Table 4-Potato Dimensions
Weight Before Osmosis
Weight After Osmosis
information from Data Table 4, fill in the following chart. Describe the
tonicity for the potato cells compared to each tube solution and describe the
tonicity of the tube solutions compared to the potato cells. Which is isotonic, hypertonic, or hypotonic
and how did the water move? (into the
cell, our of the cells, no water movement)
Tubes of Potato
Hypotonic, Hypertonic, or Isotonic
Describe the movement of water
is the condition of each potato strip after soaking in the test tubes for an
hour? Which one is limp and which one is
would you explain the difference in the conditions of the potato strips using
the concept of tonicity?
How do the changes in the conditions of the potato
strips relate to the wilting of plants?