Osmosis Essay

the lipid portions of the membrane." (Anatomy and Physiology Textbook 86) The rate of diffusion is affected by surface area available and temperature because it affects the way that the partials move. Although osmosis may seem similar to diffusion, it's this whole other transport. Osmosis is the diffusion of a substance through the membrane from a reduced solution to a concentrated solution. "Some solutes diffuse into the cytoplasm, others diffuse out, and a few (such as proteins) are unable to…

Demonstration of the Relationship between the Surface Area to Volume ratio on the rate of Diffusion Introduction: The surface area to volume ratio determines the rate of diffusion, the larger it is the faster nutrients will diffuse. Phenolphthalein acts as an acid-base indicator, turning pink in bases like NaOH and being colorless in acids like HCl. Using agar blocks as cells, a model was made to measure the rate of diffusion of different sized pink agar blocks changing to colorless ones.…

non-tuber fruits (apples). To determine the water potentials, our focus during the lab was to collect data for osmosis rates in different sucrose concentrations. Background Information Now that we have discussed osmosis and free water, we can introduce the idea of water potential to mathematically represent concentration gradients. In cells, we must consider the effect of pressure on osmosis. Plant cells have cell walls that will cause pressure to build up when water diffuses into the cell. Both…

the molar sucrose concentration at equilibrium. I had to extrapolated the point at which it crossed the x-axis. This led to the data being unreliable because there is no physical evidence present that shows the psi of the solute. Introduction: Osmosis is the diffusion, the process by which solutes move down their concentration gradient, from higher concentration to a lower concentration, of free water across a selectively permeable membrane. The water moves from the higher free water…

by osmosis through the lipid bilayer of cell membranes. But because of the high water permeability of some epithelial cells it was suspected, that another transport mechanism existed. The research and discovery of water channels by Agre and his colleagues, won them the nobel prize in chemistry in 2003. Without the discovery of Aquaporins, we would still think that water was actively transported on carriers, just like Na+ and other ions are. But we know now that water is reabsorbed by osmosis…

Abstract This lab was conducted in order to determine the molarity of sucrose concentration where the mass of 2cm^3 of Classic Russet potato segments and pear segments does not change, representing an isotonic concentration. By calculating the change of mass of the potato segment and pear segments prior to being placed in the sucrose solution against the mass after being in the sucrose solution for 45 minutes. Our goal was to determine what type of osmotic concentration was created as compared…

the dialysis was used for the diffusion and osmosis of iodine, glucose, starch and water. However, starch was unable to pass through the membrane due to it being too large. This is where it does not fully resemble a cell membrane because it can not transform and undergo things such as endocytosis to allow all the molecules to pass through. Conclusion This lab provided a good perspective of the movement of molecules diffusing and going through osmosis into a cell. The ability of the cell…

EFFECTS OF OSMOSIS INTRODUCTION Osmosis is the process where molecules of a solvent are prone to pass through a semi-permeable membrane, going from a less concentrated solution to a higher concentrated solution. Doing this equalizes the concentrations on both sides of the membrane. Our question throughout the experiment was; What effects do the different concentrations of sucrose have on the rate of osmosis? The hypothesis was; If the solute concentrations do effect the rate of osmosis, then if…

Question: How does temperature affect the rate of osmosis in raisins? Background: Osmosis is the passage of a solvent through a semipermeable membrane from a less concentrated to a more concentrated solution until both solutions are of the same concentration We designed an experiment that would test if a raisins rate of osmosis is affected by the temperature of water it is placed in. The independent variable in this experiment was time which was 10 minute intervals. The dependent variable…

The purpose of this EEI is to create and analyse an experiment that relates to and supports the theory of osmosis in biological cells. Cells are the biological building block for all life; all living organisms have cells also. Cells provide structure, absorb nutrients from food and convert those nutrients into energy so that the cell can carry out specialized functions. There are two main categories with most organisms and their cells; prokaryotes and eukaryotes. The distinctive difference…