rate of osmosis Hypothesis: The more hypertonic potato pieces are to a saline solution‚ the more weight the potato will gain. However‚ the potato pieces will decrease in weight when they are placed in a hypotonic solution. Dependent variables: • Change in mass of pieces of potatoes. Independent variables: • solutions sucrose concentrations. Controlled variables: • amount of time in the solutions • surface area of the potato segments Factors held constant: Identify and
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instructor. Observations Data Table 1: Comparison of States of Tonicity Test Tube Solute/Solvent Appearance of Potato Strip Type of Tonicity Gradient: Is the potato strip in a Hypertonic‚ Hypotonic‚ or Isotonic at the beginning of this exercise? 1 Distilled Water Bigger Hypotonic 2 10% NaClWithered Hypertonic Data Table 2: Comparison of Turgor Pressure States in Elodea Leaf Cells Solute/Solvent
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Extract Preparation Several samples of Agaricus bisporus were dissected into their various anatomical components (see Figure 1.) 9.1248 g of the lower stem (S2) was collected and frozen with liquid nitrogen. The frozen sample was ground up and mixed with 28.9 mL ± 0.1 mL of a sodium phosphate buffer (50 mM‚ pH 6.5). The mixture was then transferred into a centrifuge tube and placed in a Beckman Coulter Avanti J-26 XPI high speed centrifuge. The sample was spun at 20‚000 rcf for 20 minutes at 4
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Transformation of Amyloplasts into Chloroplasts in Potato Tubers’ Received for publication November 9‚ 1983 and in revised form January 19‚ 1984 YU S. ZHU‚ DENISE L. MERKLE-LEHMAN‚ SHAIN D. KUNG* Department of Biological Sciences‚ University of Maryland Baltimore County‚ Catonsville‚ Maryland 21228 ABSTRACT The transformation of amyloplast into chloroplasts in potato (Solawum tuberosum L.) tuber tissue can be induced by light. Excised potato tuber discs illuminated with white light of 3000
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I predict that if the potato has a neutral pH (close to 7)‚ then the function of catalase will be at its maximum capacity because our bodies have a neutral pH and our livers‚ which contain catalase‚ work perfectly fine even in these conditions. This study is worth pursuing because
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Topic: Osmosis Materials: Potato cylinders‚ 20 percent sodium chloride solution‚ three test-tubes‚ test-tube rack‚ scalpel blade‚ Gel ink pen‚ syringe-10cm^3‚ Plastic ruler with mm‚ tile‚ forceps filter paper‚ Masking tape. Method: 1) Three test-tubes‚ A‚ B and C were labeled and initials of experimenters were applied with the date: January 29‚ 2013. 2) A syringe was used to put 10cm^3 of water in tube A and 5cm^3 in tube B along with 5cm^ 20 percent sodium chloride solution and 10cm^3 20 percent
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________________________________________________ Introduction: What was your null hypothesis? be specific A change in temperature in the reaction of catechol and catecholase will not change the absorbance of reaction over time. What was your alternative hypothesis? be specific As the environment and temperature is changed from 0 °c to 20°c to 95°c‚ the absorbance of catechol and catecholase reaction will increase over time. The rate of reaction increases as the temperature increases. Results: What were the main trends
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there would be hypertonic causing the cell to shrink. We created models of living cells by using dialysis tubing. The dialysis tube represented the cell membrane to act as selectively permeable to water and some solutes. We observed different solutes (NaCl‚ Ovalbumin‚ Glucose‚ Sucrose‚ and Water) in the dialysis tubing. The problem was what environment the solutes would create and whether water would diffuse in or out of the cell. I predicted that all of the tubes will be in a hypotonic environment after
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Michelle Yeung Bio 101 Cyrus MacFoy June 16‚2015 Diffusion and Osmosis Exercise I. Molecules are always in constant movement. Molecular motion is a form of energy‚ the kinetic energy of molecules. The Brownian movement is the movement of small particles caused by the bombardment of the particles by millions of water molecule. This movement will continue indefinitely as long as there is water. My prediction for this lab is the solution of the water is hypertonic meaning there is a higher concentration
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solution 4. Hypertonic solution 5. Light microscope Experiment 2: Osmosis 1. 4 slides 2. Potato 3. Hypotonic solution 4. Hypertonic solution Experiment 3: Ferrous 1. Ferrous Sulfate 2. Potassium Ferricyanide 3. Slides 4. A Ruler Procedure-Data * We‚ as a group‚ needed two potato slices‚ water‚ and a salt. * A potato slice was dropped into the tap water and the other
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