Benedict's Indicator - Tests for glucose, Positive test for glucose - Benedict's + glucose = orange, What must you do to Benedict's for it to work? - Heat it up, Lugol's Iodine - Test for starch, Positive test for starch - Lugol's iodine + starch = blue black , Dialysis tubing - Special tubing we used in the lab to simulate a cell membrane, How can molecules pass through the dialysis tubing? - A molecule must be small enough to fit through the microscopic pores, Is glucose small enough to pass through the pores? - Yes, Is iodine small enough to pass through the pores? - Yes, Is starch small enough to pass through the pores? - No, Initial setup of the model cell in the lab - Iodine to the beaker water, and glucose and starch to the inside of the cell, Final setup of the model cell in the lab - Iodine in and out of the cell, glucose in and out of the cell and starch only on the inside, What color was the model cell to start? - White, What color was the model cell at the end? - Blue/black, What does salt water do to an onion cell? - Pulls water out of the cell and causes the cell membrane to shrivel, Does the cell wall of an onion change after adding salt water? - No. The cell wall stays intact, What does distilled water do to an onion cell? - Causes water to rush into the cell and pushes the cell membrane back up against the cell wall,

Diffusion through a Membrane Lab

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