19 what is the role of the various temperatures in

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19. What is the role of the various temperatures in this exercise? To test the stress of the membranes. 20. What happens to the beet sections placed in the freezer? Hopefully the membranes get frozen intact but they may crack & break open. 21. What is the role of the Organic solvents in this exercise? To test the stress of the membranes. 22. Identify the two organic solvents used in this exercise. Acetone & Methanol Exercise 5.6: 23. When the vacuole of plant cell is filled, it pushes the cell membrane and organelles, the chloroplasts being the most visible, against the cell wall. Describe what happens to the cell membrane and organelles when the vacuole loses water (volume). The vacuole contracts which then contracts the cell membrane while freeing up space for the organelles. 24. What is the term used to describe the above final condition of the plant cell, and under what osmotic conditions will it occur? Plasmolysis occurs when the cell is in a hypertonic solution. Exercise 5.7: 25. What cellular parts are absent from the animal cell when compared to the plant cell? Cell wall & central vacuole 26. Identify the salt concentration that should cause the animal cells to: a) shrink: Hypertonic (10% NaCl solution) b) burst (and therefore difficult to find): Hypotonic (100% H 2 O) 27. Give the correct term used to describe the condition when red blood cells: a) shrink: Crenation b) burst: Hemolysis
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