The possible errors for labA could be a leak in the dialysis bag from the floss not being tight enough. For labB a possible error could be the oils from your hands blocking the pores messing up the data.Inaccurate measuring like not completely drying the potatoes or dialysis bag. Calculating or copying down the data incorrectly are all big factors that could’ve messed up the data. This experiment relates to
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fluid is. Experiment 2 1. Iodine seeped into the bag causing it to turn purple. 2. The starch 3. No 4. The contains more starch. The beaker contains more glucose. 5. The beaker was more hypotonic in regards to the IKI solution while the baggie was more hypotonic in regards to the starch. 6. The iodine would seep out of the bag and turn the beaker solution purple. 8. The dialysis tubing represents a cell membrane. 9. Glucose will only continue to diffuse until there are
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Osmosis Katy Hunter 10-26-2012 Abstract: The objectives of this lab was to be able to create models of cells with the dialysis tubing to show us how the plasma membrane is selectively permeable‚ to study the effects of osmosis on a model cell‚ and to foresee the effect of solute concentration on osmosis. In order to achieve these objectives‚ we had to fill the dialysis tubing with either water‚ or different amounts of sucrose. We then tied off the tubes and put them into beakers of distilled
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level will rise as the iodine stained water moves through the cellulose bag due to osmosis. The iodine is there so we can see this happening. Materials: * Dialysis(cellulose) tubing * Thistle funnel * Gas jar * Retort clamp and stand * Rubber bands * 50mL beaker * Iodine/potassium iodine solution * 5% starch solution Method: 1) Fill the gas jar to 3 quarters full with water. Add iodine solution until the water is quite yellow/brown. 2) Moisten the cellulose
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Because of the selective permeability of the membrane only water and other very small particles (iodine) can be diffused through simple diffusion. The solution out of the dialysis tubing had a higher distelled iodine concentration of solutes (iodine + H2O) than did the starch solution. So iodine move into the cell and react with starch molecules to formed starchiodine‚ the blue compound‚ with a specific rate. The test show that mean rates of diffusion are significantly different acording to the concentration
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AP Biology EDVO-Kit # 281 Principles & Practice of Diffusion and Osmosis Table of Contents Lab # 1 Experiment Components Experiment Requirements Background Information Experiment Procedures Experiment Overview PART A. Diffusion and Dialysis PART B. Osmosis PART C. Water Potential PART D. Onion Cell Plasmolysis Study Questions Instructor ’s Guidelines Notes to the Instructor Pre-Lab Preparations Experiment Results and Analysis Study Questions and Answers Material Safety Data Sheets
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experiment is to exemplify how differences in molecular weight allow separation of polymers from their monomers. Methods of dialysis and gel filtration chromatography will be used to separate a glucose monomer from a starch polymer. Colorimetric glucose oxidase assay will be used to monitor the presence of glucose and a colorimetric iodine assay will be used to monitor the presence of starch in prepared solutions after separation Results and Discussion Table 1: Glucose oxidase assays |Reagents
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solution. B. How do these two freezing points compare? C. What are some practical applications of freezing point depression‚ boiling point elevation‚ and vapor pressure lowering? Questions - Part 2 A. To what biological structure is the dialysis bag comparable? How is it similar? How is it different? B. In biological systems if a cell is placed into a salt solution in which the salt concentration in the solution is lower than in the cell‚ the solution is said to be hypotonic. Water will
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Suggested answers to Practical Workbook for SBA Ch 1 Introducing biology Practical 1.1 Design an investigation of the effect of fresh pineapple on the setting of jelly Propose a hypothesis (p. 1-2) It is the fresh pineapple that causes the jelly to remain in liquid form. Design and perform an experiment (p. 1-2) 1 (Answer varies with Ss. The recommended quantity of jelly powder and water is stated on the packet of the jelly powder. Jelly will not set if it is too dilute.)
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Lab Manual Introductory Biology (Version 1.4) © 2010 eScience Labs‚ LLC All rights reserved www.esciencelabs.com • 888.375.5487 2 Table of Contents: Introduction: Lab 1: The Scientific Method Lab 2: Writing a Lab Report Lab 3: Data Measurement Lab 4: Introduction to the Microscope Biological Processes: Lab 5: The Chemistry of Life Lab 6: Diffusion Lab 7: Osmosis Lab 8: Respiration Lab 9: Enzymes
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