PLASMOLYSIS Elodea 24. On the basis of your knowledge of osmosis, predict what will happen to the water in Elodea cells.

4. A cell with a selectively permeable membrane is in a solution. Urea can diffuse through the membrane (by passive diffusion in either direction) but ions such as Na*, Cl¯ and K* cannot. Which of the following is correct? Urea Urea K Urea K Inside of cell Naci Urea K K Naci Naci K+ Urea K+ Urea Urea Urea Solution Urea Naci Urea K+ K+ Selectively permeable Urea NaCl Urea NaCl K Urea NaCl K non-penetrating Naci non-penetrating Urea penetrating membrane A. The solution is hypoosmotic and hypotonic relative to the cell, and the net movement of water is towards the cell B. The solution is hyperosmotic and hypotonic relative to the cell, and the net movement of water is towards the cell C. The solution is isoosmotic and isotonic relative to the cell, and the net movement of water is null D. The solution is hypoosmotic and hypertonic relative to the cell, and the net movement of water is towards the solution E. The solution is isoosmotic and hypertonic relative to the cell, and the net…

3. Osmosis is also part of the colligative properties of a solution. This time, we are going to relate it using the red blood cells and the different types of solutions namely hypertonic, hypotonic and isotonic solution. Answer the following questions: a. What is the movement of solute particles in osmosis? b. What happens to the sizes of the following red blood cells with the different types of solutions? i. Hypertonic solution ii. Hypotonic solution_ i. Isotonic solution 4. Enumerate at least 3 – 5 practical applications of colligative properties in everyday lives

19)Which of the following is most likely to induce osmosis if red blood cells are place in a high concentration of it? H2O     the amino acid glycine     glycerol (CH2OH-CHOH-CH2OH)     butane (CH3CH2CH2CH3)

Regarding osmosis, be able to predict the movement of water molecules when cells are placed in solutions with various tonicities.

1. Which of these compounds will cross the cell membrane without the aid of a membrane transport protein, and why? H3 NH NH 2. By what transport process will the above compound be transported? What are the factors which drive movement across the membrane in this process? Does this process require input of energy?

6- One of the following is an example about the secondary active transport: a- Glucose/ Na* C- H/k b- Kt/Nat d- None of the above

28.