GCSE Biology: Osmosis in a Potato Aim To investigate the effect of placing a piece of potato in a given strength of sugar solution. Prediction I predict that‚ as the solution becomes more concentrated the more the cell will shrink‚ as the water‚ of higher concentration inside the potato cells‚ flows down a concentration gradient into the solution‚ which has a lower concentration of water molecules. If we say that the percentage change when the potato is placed in the 1M solution is x%. I predict
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water either into the potato cells or out of the potato cells. In the 0.400M solution‚ the potato decreased in mass‚ this was due to the reason that the solution was hypertonic. There was a higher concentration of solute and lower concentration of water in the solution than there was in the potato cells. This led the water to travel down its concentration gradient‚ which was from a higher concentration (in the cell) to a lower concentration (in the solution)‚ which meant the potato cells lost water‚
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in grams) of potato cores placed in them overnight (approximately 10 hours)? 2. Hypothesis Alternative hypothesis: As the concentration of sodium chloride in the solution increases‚ the mass of the potato cores will decrease. If the solution they are in has a lower water potential than the potato cores‚ there will be net movement of water out of the potato cores. If the solution has a higher water potential than the potato cores‚ there will be net movement of water into the potato pieces. Therefore
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OBJECTIVE The Objective of this project is to study the rates of fermentation of the following fruit or vegetable juices. i. Apple juice ii. Carrot juice INTRODUCTION Fermentation is the slow decomposition of complex organic compound into simpler compounds by the action of enzymes. Enzymes are complex organic compounds‚ generally proteins. Examples of fermentation are: souring of milk or curd‚ bread making‚ wine making and brewing. The word Fermentation has been
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The Affects of pH on Peroxidase Enzyme Claire Bell Biology 1130 Jazmen Myers Section 36 Abstract Peroxidase is a turnip enzyme; it is used in the oxidation of hydrogen peroxide to lower activation energy‚ speeding up the reaction. The activity of peroxidase is highly dependent on its environment and most importantly the pH level. Peroxidase has been the focus of many recent studies and is believed to possibly reduce swelling among other things. We conducted an experiment testing
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The effect of environmental factors such as temperature‚ osmotic pressure‚ oxygen concentration and pH on microbial growth and survival Abstract: Microbial growth can be affected by different environmental factors such as temperature‚ osmotic pressure‚ oxygen concentration and pH. Six experiments were carried out in this report testing for microbial growth against different environmental factors. Good aseptic techniques were used to prevent contamination‚ resulting in a uniform set of results
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Date: _____________ Student Exploration: pH Analysis Vocabulary: acid‚ acidic‚ alkaline‚ base‚ indicator‚ neutral‚ pH Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Acids are substances that produce hydrogen ions (H+) when dissolved in water. Lemon juice is an example of an acid. A. What does lemon juice taste like? __Sour.______________________________ B. What does it feel like if lemon juice gets in your eye? ___It stings/burns!______ 2. Bases are substances
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digestive power of pepsin is greatest at the acidity of normal gastric juice (pH 1.5–2.5). In the intestine the gastric acids are neutralized (pH 7)‚ and pepsin is no longer effective. "Pepsin (biochemistry)." Encyclopedia Britannica Online. Encyclopedia Britannica‚ n.d. Web. 10 Dec. 2012. Research Question: Does changing the pH of pepsin affect the ability to break down the protein (mass of jello). Variables: independent- Ph level dependent- The mass of the jello
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Appendix-1 Introduction Mr. Juicy already a key juice producer and distributor in Hong Kong‚ dominating over 65% market share in Hong Kong. It offers wide range of juice including orange‚ grape‚ blackcurrant ‚apple‚ pink grapefruit and mango. It is owned by AS Watson‚ a wholly owned subsidiary of Hutchison Whampoa Limited. In the world’s fastest grow¬ing economy are beginning to demand a brand-name product like us when they order juice for the home‚ a mixer with their nightclub drink. Mr
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Summary The poem begins with our speaker at his desk‚ his pen poised to begin writing. He gets distracted by the sound of his father outside‚ working in the garden‚ and this sends our speaker into a spiral of memories about his father working in the potato fields when the speaker was a young boy. The memory stretches even further back to his grandfather and the hard work he did as a peat harvester (there’s all kinds of hard work going on). Eventually‚ our speaker snaps out of his daydream‚ and we find
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