solution lacking AgNO3‚ showed the cells expanded‚ to the point of explosion from a hypotonic solution( Figure 1). Incipient plasmolysis occurred in the solution that contained AgNO3 in the sucrose concentration of 0.4M (Figure 2). In addition‚ the Elodea cells seemed to shrink as the sucrose concentrations’ increased without AgNO3. Therefore the results were that with the addition of AgNO3‚ osmosis was not inhibited. The internal osmotic pressure at different sucrose concentrations was 0 for 0.0M
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Material and Methods * Osmosis : -thistle funnel tube -dialysis tubing sack -saturated NaCl w/food coloring -beaker with distilled H2O The experiments begins with the construction of a simple osmometer by obtaining pre-soaked length of tubing ‚opened and tied at the end. The tube is filled with saturated NaCl solution (with added food coloring) and the thistle is inserted in the dialysis tubing. The dialysis tubing is sealed to the thistle funnel with dental floss and placed in a beaker
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diversity will fall. All three of the plants will grow but the height will differ between the control‚ moderate and high plants. The control will have a lower height‚ the moderate will be higher and the high will have the highest height. With the Elodea densa‚ Eutrophication will occur in all three aquariums. All three will be different because of the different types of fertilizer. Control will have no pollution‚ the moderate tank will have some‚ and the high tank will have a lot because of the
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Osmosis Lab: Potatoes and Elodea Background Information: Cells have a need to regulate their internal environment. They need to be able to this because cells often find themselves in environments where the concentration of dissolved solids outside the cell is different from the number of dissolved solids inside the cell. Since the solids can not move across the membrane‚ the cell responds by moving water either into or out of the cell in an attempt to balance the number dissolved particles.
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Lab Questions: Lab #4 * Why are the chloroplasts traveling along the outer perimeter of the Elodea cell? The chloroplast are traveling along the outer perimeter to help move the vital nutrients thought the cells and convert them to substances used in the cell of the elodea cell. * What is the typical size difference between animal cells and bacterial cells? One of the main difference between an animal cell and a bacterial cell is a bacterial cell contains a plasmid‚ a ring of DNA‚ opposed
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cells. Also to distinguish among plant‚ animal‚ and protest cells and identifying the organelles that are evident in them. Materials and Methods A wet mount with a sample of Elodea (a common pond weed) was prepared. The wet mount is prepared by placing a drop of water on a glass slide. A very small piece of the Elodea is placed in the water and covered with a slip cover. The slide was then placed under the light microscope and observed for cell shape‚ and identifying the different organelles evident
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a fluid relative to another fluid. • Isotonic: ➢ Having the same (or equal) osmotic pressure and same water potential since the two solutions have an equal concentration of water molecules. MATERIALS: 1. Potato slices 2. Elodea leaf/ onion scales 3. Razor blades 4. Digital balance /string /ruler 5. Varying molar of sucrose solutions (0.01 M‚ 0.02 M‚ 0.05 M‚ 0.1 M‚ 0.3 M‚ 0.5 M) 6. Tissue papers 7. Test tubes 8. Watch glass 9. Forceps
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of the organisms that you viewed. Know all of the names‚ the test is not multiple choice! Know which formed multi-cellular structures and which did not. 2. Compare the how the pigments of Elodea‚ red pepper and purple onion skin are distributed in a cell. 3. Describe the appearance of chloroplasts in Elodea‚ what is streaming? 4. Label the plant and animal cell models‚ be able to identify as either plant or animal based on what you see.. Lab 5 (4B):
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Exhibit all three modes of nutrition Photosynthesis Ingestion Absorption Ultimately spawned all multicellular kingdoms Very diverse kingdom Difficult for taxonomists to agree on classification Diverse Modes of Nutrition Use diverse modes of nutrition Ingest food Absorb nutrients from surroundings Photosynthesis Protists that ingest food are typically predators
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Autotrophic cells capture free energy through photosynthesis and chemosynthesis. Photosynthesis traps free energy present in sunlight that‚ in turn‚ is used to produce carbohydrates from carbon dioxide. Chemosynthesis captures energy present in inorganic chemicals. Cellular respiration and fermentation harvest free energy from sugars to produce free energy carriers‚ including ATP. The free energy available in sugars drives metabolic pathways in cells. Photosynthesis and respiration are interdependent processes
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