Experiment 2 : Transport Across Membrane Name : Matrix No : Group : B Semester : 1 Date of Experiment : 05.09.2013 Lecturer’s Name : Miss OBJECTIVE To study the effects of hypotonic‚ hypertonic and isotonic solutions on plant and animal cells. INTRODUCTION In cellular biology the term membrane transport refers to the collection of mechanisms that regulate the passage of solutes such as ions and small molecules through biological membranes‚ which are lipid bilayers
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J. Singer and Garth Nicolson in 1972 to describe the structural features of biological membranes. glycoproteins a protein covalently attached to a carbohydrate chain hypertonic solution causes cells to shrink; crenation in animal cells and plasmolysis in plant cells (more concentration) hypotonic solution cause cells to swell and burst; lysis in animal cells‚ turgor pressure in plant cells (less concentration) isotonic solution no change in cells osmosis diffusion of water across a semi-permeable
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What’s the difference between facilitated diffusion and simple diffusion? 7. What’s osmosis? 8. What’s the meaning of hypertonic‚ hypotonic‚ isotonic? Give examples if a RBC (red blood cell) was place in each type of solutions. 9. What’s plasmolysis and turgor pressure? 10. Compare and contrast the active transport of the sodium and potassium pump and the sodium glucose co transport? 11. What’s endocytosis? Give two examples. Exocytosis? 12. What are gap junctions‚ tight junctions‚ plasmadesmata
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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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water potential that is equal to the potato tissue water potential. In this concentration there was no net gain or loss of water from the tissues. 4F- The hypothesis was supported because when the onion cell was placed in 15% NaCl‚ it went through plasmolysis and the cells because to shrink and the purple coloring have wider distance from each cell walls. However‚ as the onion cell was placed in freshwater the water moved in reached equilibrium‚ balancing everything and returning the cell back to its
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CHAPTER I INTRODUCTION 1.1 Background Food is one of human sources of calorie‚ protein‚ fats‚ and nutrition. Yet‚ because of the highly nutritious content‚ food is susceptible to growth of microorganisms. By the presence of microorganisms in food‚ the food is more likely to have shorter shelf life. Thus‚ mostly it is resolved by the addition of antimicrobial substances to food‚ such as condiments and preservatives. Condiments and preservatives could inhibit the growth of microorganisms
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molecules in a cell are moving from a highly concentrated place to a low concentrated place. In for example‚ in air diffusers‚ the concentrated scent will release into the lowly concentrated air resulting in the air smelling nice. The process of plasmolysis is when the cell is losing water in a hypertonic solution. A hypertonic solution is when there is a greater concentration of solutes on the outside of a cell when compared with the inside of a cell. When referring to plant cells‚ turgid is when
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Biology I Cell Biology Review 1. What are the four basic parts that all cells must have? 2. Draw a simple rod-shaped prokaryote with these features: Cell membrane‚ cell wall‚ cytoplasm‚ DNA‚ one plasmid and ribosomes. Which feature is unique to bacteria? 3. How might you tell the difference a prokaryotic cell from a eukaryotic one? Which is the most primitive? Which is the most complex? 4. What organisms are classified as prokaryotes? 5. Know all the organelles we covered and their
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Introduction: This lab helps further our understanding of essential principles behind diffusion and osmosis. Permeability‚ concentration gradients‚ plasmolysis‚ water potential‚ and equilibrium were also concepts that were delved into in this lab. Understanding how diffusion and osmosis works is essential to understanding biology. Each time a cell has something move into or out of it‚ some sort of principle studied in this lab is occurring. Diffusion‚ osmosis‚ and passive and active transport are
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icJohn Melvin Mateo BS AT - 1A NSCI 121 Assignment no.1 (Finals) 1.)What is Osmosis? Osmosis is the diffusion of the movement of water from a region of higher concentration to a region of lower concentration through a cell membrane or other semi-permeable membrane until an equilibrium is reached. It is a special case of diffusion (passive transport). Basic Explanation : Osmosis can occur when there is a partially permeable membrane
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