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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Potatoes still exists in most Irish meals‚ with potato scones‚ similar to biscuits or muffins‚ a specialty in the north. Other uses for the potato included colcannon (which is mashed potatoes with kale or cabbage)‚ boxty (a cake made from grated potatoes)‚ champ (potatoes and spring onions)‚ and potato bread. The Irish have also been notorious for their cheese making for many centuries‚ making about fifty types of homemade
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thee?" In the beginning was the potato. How it found its way from the South American highlands into those little sacks of McDonald’s fries is a long‚ adventurous tale‚ involving Conquistadors‚ Marie Antoinette‚ and Thomas Jefferson. Millionaires have been made and millions more have died from dependence on that simple‚ innocent potato. Here‚ then‚ is the story of the spud‚ which reached its crowning achievement only once it had been paired with oil. The potato seems to us today to be such a staple
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with the same method‚ except to replace the Potato juice with MnO2 Hypothesis Since enzymes are a type of protein‚ they will be destroyed at high temperatures and activity rates will go down at low temperatures. Also‚ if done at low temperature and then heated to room temperature‚ the enzyme may thaw out and start reacting again. Variables Variables | Units | Range | Independent | temperature | Celcius | 0‚ 21‚ 50‚ 80 | Dependant | Potato juice and MnO2 | Centimeters | 0~5 | Controlled
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water to a 400- to 500- ml. add a few drops of solution till it turns an amber-yellow color. Leave bag in beaker for 30 minutes. Remove bag then let it dry. Record observations. Experiment 3: Obtain 7 equal size bore hole cylinder from the potato‚ cut roughly to the same size record the length and weight of each making sure they remain order. Next is to collect 7 cups filled with 100 ml of the 6 different concentrations of glucose (‚ 0.1 0.2‚ 0.3‚ 0.4‚ 0.5‚ 0.6‚ and water). Record the time
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molecules of the substance are moving from an area of higher concentration (outside of the cell) to an area of lower concentration (inside the cell) (Hammel & Schelegel 2005). Therefore‚ the water was moving into the cell‚ causing the potato cell to increase in size. The potato appeared to be quite turgid and swollen through observation. The 3% salt solution resulted in the least weight gain (g) because the solution is hypertonic – a hypertonic solution results in the water diffusing out of the cell because
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to a traditional story‚ the original potato chip recipe was created in Saratoga Springs in New- York . George Crum‚ a half black‚ a half native American Cook ‚ at Moon`s Lake house‚ wgo wad trying ro appease an unhappy customer. He sliced the potatoes very thin ‚ fried them In the 20th century‚ potato chips spread beyond chef-cooked restaurant fare and began to be mass produced for home comsuption. The Dayton ‚ Ohio-Based Mike-sell`s Potato Chips Company‚ founded in 1910‚
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membrane will push against cell wall‚ causing the cell to become turgid. However‚ animal cells do not have cell wall and huge gain of water molecules will cause the burst of the cell. The main purpose of this practical work is to observe the osmosis in potato cubes‚ onion epidermis cells and visking tubes. To examine the effect of different concentrations of sucrose solutions on the plant cells and dialysis tubings. Hazards Precautions Sharp knife‚ scalpel‚ broken glass may cause injuries. Wear lab coat
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cubes of potato would gain or lose weight depending on the amount of molar concentration of sucrose they soaked in. Solutions made of different molar concentrations of the solute sucrose were prepared before this lab. Potato cubes were weighed and recorded as the initial mass in the data. Four cubes of potato were placed into 100 mL of each solution and let stand overnight. The cubes were then taken out for the final total mass to be measured and recorded. In this experiment‚ the potato cubes were
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effect of different concentrations of sucrose on the mass of a potato cell. Results for Part One suggested that the molecular weight of albumin and starch was too large to pass through the dialysis tube‚ but glucose and sodium sulfate molecules were small enough to pass through the dialysis tube. Also‚ a decrease in water weight occurred due the dialysis tube being placed in a hypertonic solution. Results for Par Two showed the potato cell having a molar concentration of 0.2734‚ which caused sucrose
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