Learning Targets“I Can…”

-Define “selective permeability.”-Model a living cell by using dialysis tubing in a liquid medium.-Predict the results of an experiment that involves animal cells rather than plant cells.

Membrane Transport Lab

The cell membrane is selectively permeable

• What does it mean to be “selectively permeable”?Some molecules move easily through the

membrane using diffusion, while other molecules cannot move through the membrane.

Diffusion through a selectively permeable membrane . . .

What you will do?

• Add the following substances to a section of dialysis tubing . . . – Starch – Glucose– Albumin (egg white)– Oil

This will represent the “cell.”

What you will do?

• Add the dialysis tubing to a beaker of iodine

This will represent “outside the cell.”

Data

Elodea Cells

Osmosis in Plant Cells

Elodea Osmosis

Elodea Osmosis

Osmosis in Animal Cells

Blood Cells

Blood Cells

Blood Cells

References• http://www.youtube.com/watch?v=IRQLRO3dIp8&NR=1• http://www.youtube.com/watch?v=wO1yq6YTJDI• http://www.youtube.com/watch?v=VK-_YHakvho• vcbio.science.ru.nl • http://bcs.whfreeman.com/thelifewire/content/chp05/0502001.html• josts.net • discover.edventures.com • library.thinkquest.org • science.pc.athabascau.ca • wn.com • biologylessons.sdsu.edu • csm.jmu.edu