DIFFUSION AND OSMOSIS: WHAT’S TO EXPECT? Diffusion and osmosis are very important in biological process. Diffusion is the movement of molecules or ions from a region of their high concentration to a region of their low concentration. Osmosis is the diffusion of water molecules across a semipermeable membrane. To gain a better understanding of diffusion and osmosis‚ we examine multiple experiments to show diffusion and osmosis in animal cell‚ plant cell and synthetic cell. In our first experiment
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BIOLOGY 1406 REVIEW FOR EXAM II Chapter 6: A Tour of the Cell I. The microscope A. Differences between light microscope‚ scanning and transmission electron microscope B. Relationship between magnification‚ resolution and contrast II. Compare and contrast prokaryotic and eukaryotic cells III. Know parts of the cells‚ their structure and function A. The nucleus B. Ribosomes C. Endomembrane system 1. Nuclear envelope 2. Endoplasmic reticulum (ER) a. Rough ER-has
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that has a higher concentration of solutes than another solution is said to be hypertonic‚ and water molecules tend to diffuse into a hypertonic solution. Cells in a hypertonic solution will shrivel as water leaves the cell via osmosis. If a solution has a lower concentration of solutes than another solution it is said to be hypotonic‚ and water molecules tend to diffuse out of a hypotonic solution. Cells in a hypotonic solution will take on too much water and swell. The purpose of this experiment
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Microbiology Lab Quiz #2 Study Guide Exercise 9 -- The Gram Stain Compare and contrast simple and differential staining techniques. Simple Staining Simple staining is useful in determining the basic morphology of an organism. Simple staining involves only one reagent i.e. crystal violet‚ basic fuchsin‚ or methylene blue. Simple dyes used to stain bacteria have a positive charge cationic (+)‚ therefore‚ they are attracted to the bacteria that are usually negatively charged anionic (-) Depends
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after removing them from the solution. Introduction: Determining osmolarity in plant cells is important to scientists when performing experiments. In order for normal physiological processes to occur in plant cells‚ the plant cell must be in an isotonic solution; it must have the same amount of osmotically active substance (OAS) inside the cell as well as outside the
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What is the effect of Osmosis on a chicken egg? What is the effect of different solutions with various concentrations on plant cells? Hypothesis: 1. In an animal cell in a hypertonic solution the egg will swell‚ in a hypotonic solution the egg will swell. 2. In a plant cell in a hypertonic solution it will shrink‚ and in a hypotonic solution it will swell. Methodology: Part 1. A chicken egg is consecutively over time placed in each of 3 jars‚ each containing vinegar‚ syrup and water. The eggs appearance
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Introduction: The objective of this experiment is to demonstrate osmosis by using an egg as a model. In order for this to happen the vinegar will make the eggs shell disappears. The reason for this is because vinegar has acetic acid and the shell has calcium carbonate‚ when these come into contact it produces carbon dioxide. This is the reasoning for the little bubbles when the egg is first put into the vinegar. After the shell discinigrates it will become rubbery from the acetic acid‚ at this
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Raisha Miggins Lab 5: Osmosis Purpose The purpose of this lab was to explore the concept of Osmosis using dialysis tubing and different concentrations of sucrose solutions‚ and to help one better understand what happens to cells when they are exposed to solutions of differing tonicities. Hypothesis If the four dialysis tubes containing different concentrations of sucrose are all placed in their appropriate solutions for 20 minutes‚ then my predictions are as follows: The 1% in 1% sugar solution
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in potato core length is 4 mm so the potato is hypertonic to that solution. In test tube 2 with a 0.625% salt concentration‚ the potato core length after is 42 mm‚ the change in potato length is 2 mm so the potato is hypertonic to that solution. In test tube 3 with a 1.25% salt concentration‚ the potato core length after is 39 mm‚ the change in potato length is -1 mm so the potato is
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Microbiology Lecture Exam #1 Outline Chapter 1: Microbiology Introduction I. Microbiology Definition II. History of Microbiology (Christian Gram‚ Robert Koch‚ Antony van Leeuwenhoek‚ Robert Hook‚ Edward Jenner‚ Louis Pasteur‚ Elie Metchnikoff‚ Dmitri Iwanowski‚ Paul Ehrlich‚ Alexander Fleming) II. Scope of Microbiology A. Infectious Agents 1. Prions 2. Viroids 3. Viruses B. Prokaryotes
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