Diffusion and Osmosis Introduction Tonicity refers to the concentration of solutes in a solution (Lab 6-7). There are three stages of tonicity: Isotonic‚ hypertonic and hypotonic. Four unknown solutions were given and labeled as followed: Solution A‚ Solution B‚ Solution C‚ and Solution D. Since potato cells were used for this type of experiment‚ in an Isotonic solution the solute and water concentration are the same as inside the cell in which the isotonic solution contains 0.9% NaCl. In other words
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Newtons and record it. Plug the force sensor into channel 1 of your LabQuest 2‚ this allows you to calculate the amount of force that you pull the block with. Choose six of the slotted masses to place on the blocks‚ a different one each trial. After choosing which slotted masses you are using convert their mass to kilograms and multiply by g‚ 9.8‚ to find their weight in Newtons. For each of the six slotted masses add their Newtonian weight to the Newtonian weight of each block‚ the sandpaper block and
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WATER FLOW ACROSS CELL MEMBRANES pg. 1 Lab Report 1 Water Flow Across Semi-Permeable Membranes WATER FLOW ACROSS CELL MEMBRANES pg.2 WATER FLOW ACROSS CELL MEMBRANES The movement of water across semi-permeable membranes as it relates to the laws of thermodynamics and energy flow with the diffusion
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Practical 7 Osmosis Name: Diana Baktybayeva Tutorial Group: D Lab Partner: Nurlan Mukazhanov Day: Monday afternoon Date: 17.11.14 Title: Osmosis Introduction. Osmosis is a particular type of passive transport involving the movement of water molecules from the region of low solute concentration to the region of high solute concentration through semi permeable membrane‚ which allows movement of solvent molecules‚ but not solute. The main principle of osmosis is to equalize
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Biological Membranes Lipid Membranes • Receptors‚ detecting the signals from outside: Light Odorant Taste Chemicals A Hormones Neurotransmitters Drugs • Channels‚ gates and pumps • Electric/chemical potential Neurophysiology Energy • Energy transduction: Photosynthesis Oxidative phosphorylation • • • • • • Structure Function Composition Physicochemical properties Self-assembly Molecular models highly selective permeability barrier Internal membranes for organelles Bilayer Permeability
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Ben Zaré 9MK Biology Investigation - Osmosis in Potato Cells 9/7/04 Section 1 Planning Aim What is the aim of your experiment? What do you want to find out? The aim of this experiment is to investigate how potato tissue changes when placed in sucrose solution of different concentrations. Therefore‚ I want to find out if and how osmosis differs‚ when the concentration is changed. Variables What is the variable you are going to change in the experiment?
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Introduction In this experiment‚ I measured the impact of two different topical chemicals on growing bacteria over the course of a week. Bleach‚ water‚ hand sanitizer and hand soap were all variables used to observe the effects of the bacteria swabbed from my palm and fingers. Bleach has been the go to product for killing germs and it is because of the similar effects it has with high temperature on the proteins in bacteria. I hypothesized that bleach would be the most efficient way for killing the
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substances across the plasma membrane‚ and to indicate the driving force for each. This may also be applied to the study of transport mechanisms in living membrane-bounded cells. Also‚ understanding of which way substances will move passively through a deferentially permeable membrane depending on the concentration differences. We used PhysioEx software to examine diffusion. In these experiments we used different sized membranes as well as NaCl‚ urea‚ glucose‚ albumin‚ powdered charcoal‚ and KCl.
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Topic 2 – Cell membranes Reading Chapter 5 Objectives Functions of cell membranes The fluid mosaic model The lipid bilayer – phospholipids‚ glycolipids and sterols Properties of the lipid bilayer Membrane proteins – the ‘mosaic’ in the model Solute movements across membranes BIO 1140 – SLIDE 1 http://www.nikonsmallworld.com/gallery/year/2006/id/751 Functions of cell membranes – an overview Fluid mosaic model Singer & Nicolson 1972 Fluid lipid molecules in which
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Cell Membrane Permeability and Osmosis Experiment 3 Objectives: To demonstrate the mechanism involved in Osmosis; To demonstrate the tonicity of solutions by subjecting the cells to different concentration of solute. To view‚ under the microscope‚ any change in the shape and volume of the cells after subjecting them to different concentrations of solutes; To demonstrate the permeability of cell membrane by subjecting the cells to different solutes; To demonstrate the mechanism involved in
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