Upon completion of this lab exercise the student will be able to:
differential (selective) permeability
2. Differentiate which transport processes are active transport and which are
3. For each transport process, describe the force causing the process to
4. Given appropriate information concerning concentration differences and
membrane permeability to solutes, be able to determine which way
solutes or water will passively move through a differentially permeable
Human Anatomy & Physiology, 7th edition, Marieb and Hoehn, pp 70-81.
Anatomy and Physiology I Laboratory Manual
Osmosis and Diffusion Worksheet, pp. 19-20.
PhysioEx: Cell Transport Mechanisms and Permeability pp. 21-26
PhysioEx: Cell Transport Mechanisms and Permeability Worksheet,
Osmosis and Diffusion Worksheet
a. Observe the agar plate with dyes. Describe what has happened. What
caused this activity?
b. All dyes were placed in the agar at the same time. Why did some dyes
move further in the agar than others?
c. Obtain a beaker and fill it halfway with tap water and add 10 drops of
iodine. Pour some starch solution into a plastic sandwich bag and tie the
bag shut. Put the baggie in the beaker. In 15 minutes check the beaker.
Describe the results and explain what has happened.
a. There are three dialysis bags and three solutions. Use the table below
to record your data.
Contents of Contents of Starting Ending
Beaker Bag Weight Weight
What type of solution is represented in beaker 1?
What type of solution is represented in beaker 2?
What type of solution is represented in beaker 3?
What moved across the membrane? Why?
b. Observe the eggs on demonstration. Describe what you see and explain
3. The cytoplasm of a cell contains no glucose (it is quickly consumed for
energy) and 0.9% NaCl. The cell membrane is permeable to glucose but
not to ions. If a cell is placed in a solution containing 5% glucose and 2%
NaCl, what will happen to the cell and the solution?