1. You place salt in two sides of a dish that is separated by a selectively permeable membrane. Side A has 5 % salt, side B has 8 % salt. Draw this system, determine what type of transport would be used and determine the direction of the movement of salt. Describe what happens with a cell when it is placed in sea water. Describe what happens with a cell when it is placed in distilled water.

2. In a bag with a selectively permeable membrane you have a solution of 4 % salt and 2 % starch. The bag is permeable to salt but not to starch. You place this in a beaker with distilled water. Draw this system, determine the direction of the movement of various substances and determine the type(s) of transport used. Describe what happens with a plant cell when it is placed in a hypotonic solution.

3. In each of the examples shown below, which of the solutions is hypertonic?

4. Name the transport type for all of the following: – white blood cell engulfs a bacterium as you fight off an infection – Carbon dioxide (a small uncharged gas molecule) enters the lungs (where it is less concentrated) from the blood (where it is more concentrated). – Cells of the stomach wall transport hydrogen ions through a ATP-dependent membrane protein to the inside of the stomach, producing a pH of 1.5. The pH of the cytosol (fluid inside the cells) of stomach wall cells is approximately 7. – The lung cells of a victim who drowned in fresh water are swollen due to water entering the cells. – A Paramecium (a single celled organism) swims into an area of salty water.. The Paramecium shrivels up as it loses water through its cell membrane.

5. Draw and label the parts of the cell membrane. List the functions of membrane proteins Name the function of carbohydrates and cholesterol in the membrane List three functions of the cell membrane. Define endocytosis and list its types. Compare and contrast active and passive transport (have at least three similarities and 3 differences) Define bulk transport.