Your search returned over 400 essays for "permeable membrane"
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How Molecules Can Move Across A Semi Permeable Membrane

- The purpose of this lab is to determine which molecules can move across a semi-permeable membrane. The hypothesis for this experiment is as follows; As the smaller molecules of iodine travel through the “cell membrane” the artificial cell will gain mass. Dialysis tubing, a thin membrane that behaves in much the same way as a living cell’s actual plasma membrane, was used to test this experiment. After filling the dialysis tubing with the starch and glucose solutions, the artificial cell was then submerged in a water and iodine solution, and the results we’re recorded after 30 minutes....   [tags: Cell membrane, Cell, Semipermeable membrane]

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Osmosis Through A Semi Permeable Membrane Using Dialysis Bags

- In this experiment we took dialysis bags and filled them with various sucrose solutions and put them in water over a period of about 90 minutes to look at the osmosis in each bag and the tonicity of each environment the bags were in. We also took potato pieces and submerged them into various sucrose solutions to determine the ideal state of tonicity for plants and the osmosis that occurred over a period of time. The final results for the first exercise was that 0.8M sucrose solution gained the most mass and that it was hypertonic to its environment....   [tags: Osmosis, Semipermeable membrane, Diffusion]

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The Diffusion Of Water Across The Semi Permeable Membrane

- Introduction Osmosis is the diffusion of water across the semi-permeable membrane from a region of low solute concentration to an area of high solute concentration in order to equalize the level of water in each region. Hypertonic, hypotonic and isotonic solutions are involved in this process. Water tends to move from a high to low concentration area, towards a higher solute concentration is hypertonic. When there is more solute outside of a cell, the cell is hypotonic, and when there is more solute inside a cell, the cell is hypertonic....   [tags: Osmosis, Concentration, Solution, Measurement]

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Investigating the Movement of Osmosis through a Selectively Permeable Membrane

- Investigating the Movement of Osmosis through a Selectively Permeable Membrane My aim for this experiment is to see the percentage increase decrease and results of potato tissue's mass difference, when placed in different concentrations of sugar solutions. This investigation would expect to have 3 different variables, Independent, which you can change, the thing that I will be changing in this investigation for the factors affecting osmosis, is the concentrations of the solution that changes the mass and investigate osmosis with potato tissues....   [tags: Papers]

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How Does The Term Fluid Mosaic Describe The Structure Of The Plasma Membrane?

- Essay Quiz 1. How does the term fluid mosaic describe the structure of the plasma membrane. Let’s find out first what it is plasma membrane and its function. The plasma membrane is the boundary between the cell and its environment. It regulates what enters and exits the cell. Plasma membrane plays a vital role in protecting the integrity of the interior of the cell by allowing only selected substances into the cell and keeping other substances out. It also serves as a base of attachment for the cytoskeleton in some organisms and the cell wall in others....   [tags: Cell, Cell membrane, Protein, Cell wall]

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The Effects of Varying, Extreme Temperatures and Varying Organic Solvents on a Beet Root Cell Membrane

- ... This can be explained because it is the longest chained alcohol when compared to the others that were used in the experiment (Bio. Sciences Dept., 2013). It is theorized that the cell membrane is significantly reformed following the attachment of the 2-propanol to the membrane phospholipids. (Wanderlingh et al., 2010). This change in the membrane could be related to the high amount of leakage recorded by the spectrophotometer, as these changes could rupture the plasma membrane if a sufficient amount of the alcohol is present (Wanderlingh et al., 2010)....   [tags: molecules, hydrophilic, membrane]

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The Effect Of Permeability On The Membrane Using Chemicals And Beta Vulgaris ( Beetroot )

- ‘The affect of permeability in the membrane using chemicals and Beta Vulgaris (beetroot)’ Introduction: All cells are surrounded by a cell membrane, which has a semi-permeable phospholipid bilayer (Mitchell, 2015, Flinders University). A membrane is comprised of lipids, proteins and carbohydrates (Mitchell, 2015, Flinders University). Membrane permeability is determined by the structure of the membrane, meaning some larger substances will not pass through the membrane (Flinders University, 2015, p.36)....   [tags: Cell membrane, Lipid bilayer, Chemistry, Beet]

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The Plasma Membrane of Eukaryotic Cells

- The plasma membrane of eukaryotic cells performs a multitude of tasks ranging from cell signaling to transport of ions and other molecules from the extracellular matrix into the cytosol. The membrane is the result of lipid packing into a bi-layer. The plasma membrane is composed of two sections, an outer section known as the exoplasmic layer, and an inner section known as the cytosolic layer. The two layers are composed of differing lipids with the exoplasmic layer containing primarily sphingolipids and the cytosolic layer containing phospholipids1....   [tags: Biology]

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The Structure And Function Of The Cell Membrane

- 2.1 describe the structure and function of the cell membrane. The cell membrane, also known as the plasma membrane, regulates what enters and leaves the cell. The cell membrane also deals with recognition of proteins and transport that regulates the movement of water and soluble molecules throughout the membrane. The cell membrane is composed of phospholipid molecules and consists of two lipid layers in which protein molecules float; this is sometimes referred to as a “lipid sandwich” this surrounds the cell....   [tags: Mitosis, Meiosis, Chromosome, Cell cycle]

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The Function And Structure Of The Plasma Membrane

- The overall purpose of the experiments in this lab was to introduce the function and structure of the plasma membrane, describe the workings of diffusion and osmosis, and to demonstrate how different factors such as particle size, temperature, and space of diffusion area affect the rate of diffusion. With the results from the experiments, it can be concluded that all of the factors listed do affect diffusion, and there may be many more than are unaccounted for. Through the osmosis experiment, it was clear that water moved into the cell due to a lack of water and an excess of solute; in the environment, there was an excess of water and a lack of solute....   [tags: Osmosis, Cell, Diffusion, Central nervous system]

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Your search returned over 400 essays for "permeable membrane"
1  2  3  4  5  6  7  8  9   …  40    Next >>