Unit 4 Lab – Effects of Osmosis on Living Tissue Assignment Total: 35 Points Course Weight: 6 Pre-Lab Preparation - Review the following resources to complete this assignment: Textbook: Chapter 5‚ pg. 83-86 Mastering Biology / Study Area / Chapter 05 – The Working Cell / Student Home Key Concepts Video: Plasmolysis Video: Turgid Elodea Activity: Membrane Structure Activity: Diffusion Activity: Osmosis and Water Balance in Cells Bioflix: Membrane Transport Additional Resources Blast Animation: Diffusion
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EXPERIMENT ONE- BIOLOGY MODEL Answers TO DETERMINE THE EFFECT OF CHEMICALS AND TEMPERATURE ON MEMBRANE DESTRUCTION AND PERMEABILITY IN BEETROOT (Beta vulgaris) Introduction The cell membrane is made up primarily of phospholipids and proteins which contribute to its selectively permeable nature. The function and permeability of the cell membrane depends on its intact structure. When destroyed‚ the permeability of the cell membrane is disrupted causing cellular contents to leak out. The cell
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Biology GCSE Coursework: Osmosis in Potato Chips Skill Area P: Planning Aim: To investigate the effect of varying concentration of a certain sugar solution on the amount of osmotic activity between the solution and a potato chip of a given size. Hypothesis: Osmosis is defined as the net movement of water or any other solution’s molecules from a region in which they are highly concentrated to a region in which they are less concentrated. This movement must take place across a partially
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a large volume of water enters the cell‚ it swells causing the membrane to push against the cell wall which is called turgor pressure. When the water moves out of the cell‚ the membrane shrinks away from the cell wall and becomes a loose cell‚ plasmolysis. This causes the plant to wilt‚ as the cells can no longer provide support for the leaves. Figure1. How Osmosis works As already known‚ proteins in our cells do many things. One of the most important things they do is act as an enzyme. An
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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 Page 3 3 4 10 11 12 16 20 21 23 24 26 29 31 Advanced Placement
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TERM – 1 SYLLABUS 2012-201– 1 SYLLABUS 2012-2013 CLASS XI (SCIENCE) Subject Topic Practical English 1. Hornbill – The Portrait of the Lady‚ a photograph Snapshots – The Summer of the beautiful white horse The Canterville ghost – Chapter 1 Writing – Article writing‚ Note making Grammar -Determiners 2. Hornbill – We are not afraid to die if we can be all together Snapshots – The address The Canterville ghost – Chapter 2 Writing – Speech writing Grammar – Tenses 3
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pressure ( also known as osmotic pressure). The pressure that would have to be applied to a pure solvent to prevent it from passing into a given solution by osmosis‚ often used to express the concentration of the solution 5. What occurs when plasmolysis takes place? The cells shrink and shiver. 6. Define the terms endocytosis and exocytosis . * Endocytosis: the taking in of matter by a living cell by its membrane to form a vacuole. * Exocytosis: Large molecules that are manufactured
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Name Period Chapter 7: Membrane Structure and Function Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins 1. The large molecules of all living things fall into just four main classes. Name them. Explain what is meant when we say a molecule is amphipathic. 3. In the 1960s‚ the Davson-Danielli model of membrane structure was widely accepted. Describe this model and then cite two lines of evidence that were inconsistent with it. 4
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Osmosis is the movement of water from an area of high concentration to an area of low concentration across a semi permeable membrane. An osmotic system is established when a semi-permeable membrane is placed between two solutions. In this biological systems context‚ osmosis is the exchange of water between the potato cell and the surrounding medium of varying sucrose concentrated solutions‚ with the plasma membrane being the semi- permeable membrane. Because water molecules have kinetic energy‚ they
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add water. 2 Explain what happened to the cells in sodium chloride solution using biological terms. Try to include these words. cytoplasm diffusion water solvent dissolved salts solute cell membrane vacuole cell wall osmosis plasmolysis turgid flaccid turgor 3 Explain what happened to the cells when you replaced the surrounding sodium chloride solution with water. Try to include the words from the list again. 4 What prevents the plant cells from bursting when they
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