BIOL 1406: LAB EXERCISE 5

Objectives

How are substances transported within cells and across cell membranes?

After completing this exercise, you should be able to:

• Describe the kinetic theory of matter and explain what kinetic energy is.

• Distinguish between movement and net movement.  Also, describe the factors that affect the direction and speed of molecular movement and net movement.

• Define and distinguish between:  selectively permeable membrane, plasma membrane, dialysis tubing.

• For each of the following transport mechanisms, explain how the mechanism works and discuss the factors that affect the rate and direction of transport: simple diffusion, facilitated diffusion, osmosis, dialysis, active transport.

• Describe how chemical indicators can be used to test for the presence of starch and reducing sugars.

• Distinguish between isotonic, hypotonic, and hypertonic solutions.  Also explain what happens when cells are placed in each type of solution.