Osmosis The purpose of this lab is to study how membranes of plant and animal cells react when exposed to different solutions. The first experiment involves purple onion skin and the second involves rat blood in various solutions. I needed to understand certain terms before preforming this lab to be able to efficiently explain what is happening to the cells. Diffusion is the tendency of a substance to move down its concentration gradient from a more concentrated to a less concentrated area.
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Pre-Production As director‚ my objective was to tell a story cinematically. For the film‚ I chose the role of the director because I knew a numerous amount of different camera shots in which I could choose to use. The editor was given her role because she knew how to incorporate my ideas into the film. The cinematographer‚ on the other hand‚ was given his role because he had prior knowledge about cameras and could capture my vision for this film. In order to create the desired film‚ a genre was
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Using colorimetry to find the order of a reaction introduction Coloured solutions absorb some of the wavelengths in the visible region of the electromagnetic spectrum. A colorimeter can be used to measure the amount of light absorbed by a solution (the absorbance) and this is proportional to the concentration of the coloured species present. In this experiment you will use a colorimeter to investigate the reaction between bromine and methanoic acid:- Br2 (aq) + HCOOH (aq) ↓ 2Br-
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Eliza Solomon EE Notes from texts Biology section: Citation: “Evolutionary Psychology: An Introduction‚ Second Edition” by Lance Workman and Will Reader. Cambridge University Press. Printed in 2004‚ 2nd edition in 2008 in the UK. Published in NYC. “The mind‚ therefore‚ is seen as equipped with the species-specified ‘instincts’ that enabled our ancestors to survive and reproduce and which give rise to a universal human nature. This idea is in sharp contrast to the adhered
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while the other two potatoes remained firm. There was also an awful odor that only came from the potato in the tap water. Conclusion: The hypothesis was correct. The 40% salt solution killed the sailor. This solution was hypertonic which causes osmosis to move the water out of the cell. The sailor then became too dehydrated and died. Salt absorbs water‚ which is why drinking salt water is not good for
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Communication‚ Homeostasis & Energy Communication & Homeostasis Outline the need for communication systems within multicellular organisms‚ with reference to the need to respond to changes in the internal and external environment and to co-ordinate the activities of different organs. Organisms need to respond to external stimuli‚ e.g. temperature‚ oxygen concentration and levels of sunlight. These may be over time‚ e.g. winter fur to summer fur‚ or quickly‚ e.g. changing size of pupils. Internal
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Biodegradable Waste Bio-waste is defined as biodegradable garden and park waste‚ food and kitchen waste from households‚ restaurants‚ caterers and retail premises‚ and comparable waste from food processing plants. It does not include forestry or agricultural residues‚ manure‚ sewage sludge‚ or other biodegradable waste such as natural textiles‚ paper or processed wood. It also excludes those by-products of food production that never become waste. Currently the main environmental threat from
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Lu Feng BIO 182 Hillary Emick Plant Adaptation Pinus halepensis‚ commonly known as the Aleppo Pine‚ is a pine native to the Mediterranean region. In dessert‚ water is limited for plants to grow up. Pinus halepensis has plans for water management. The leaves are very slender‚ 6–12 cm (2.4–4.7 in) long‚ distinctly yellowish green and produced in pairs (rarely a few in threes).1 The needle-shaped leaves exposed area minimizes the amount of moisture lost to breezes and the sunlight. The needle-shaped
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AHP216 04/16/13 I. Introduction: The purpose of this experiment is to observe the osmosis reaction in a potato with salt and water. In cooking cooks will soak their cut potato’s in water if they will not use them immediately. This allows the potato’s to be used later without turning color. The experiment shows the flow of water through the membranes of the potato with salt over a period of four hours. II. Objective: The reaction of the potato to the side submerged in water and the half excavated
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Diffusion and Osmosis Introduction Tonicity refers to the concentration of solutes in a solution (Lab 6-7). There are three stages of tonicity: Isotonic‚ hypertonic and hypotonic. Four unknown solutions were given and labeled as followed: Solution A‚ Solution B‚ Solution C‚ and Solution D. Since potato cells were used for this type of experiment‚ in an Isotonic solution the solute and water concentration are the same as inside the cell in which the isotonic solution contains 0.9% NaCl. In other
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