I observed the different parts of passive transport: diffusion and osmosis, and recognized how they both go with the concentration gradient from an area of high to low concentration. My hypothesis for procedure 1, that all of the dialysis tubings would be in a hypotonic environment was correct. This occurred because the tubings were placed in a beaker of water, meaning that there was a higher concentration of water than the solute, causing the water to diffuse in the cell after 30 minutes. When water diffuses into the cell, this causes the cell to be enlarged. Some possible errors that could have made in the experiments would be failure to pay attention to the timing when the tubes and potatoes were in the solutions, inaccurate measuring when gathering the solutions, and differences in the size of the potatoes which may have had an effect on the results.
Potato and Osmosis Investigation PLANNING: (P) Some background Information: Water Potential and Living Plant Cells Plant Cells in Pure Water: If plant cells are placed in pure water (a hypotonic solution) water will initially move into the cells. After a period of time the cells will become turgid. Turgor pressure is the pressure exerted against the cell wall by contents of the cell. At first most water movement is into the cell. As the turgor pressure increases water will begin to diffuse out of the cell at a greater rate, eventually equilibrium will be reached and water will enter and leave the cell at the same rate.
In osmosis, water molecules move from an area of high concentration to and area of low concentration. In this instance, the body cells would be the area of high concentration because they have more unbound water molecules. Since the solute level is higher than water in his blood and fluids, this is the area of low concentration. This would cause a number of water molecules will diffuse form inside of the cell to outside of the cell. This process of osmosis will continue until the
(1988) and Arcand et al. (1994) indicated that under strong hydrodynamic shear granules formed were compact while it was hard or impossible to achieve sludge granulation under weak hydrodynamic sh... ... middle of paper ... ...ure of the biofilm, especially a reduction in the diversity resulted upon elevation is shear intensity. Kundu et al. (2013c) studied the effect of shear by increasing the upflow velocity from 4 to 10 m h-1 step by step in a hybrid anaerobic reactor, where the whole granular bed was maintained in fluidized condition. Increase in upflow velocity up to 6 m h-1 positively affected the reactor performance, but after 6 m h-1, a sharp decline in the performance of the system was observed and at 10 m h-1 the reactor was deteriorated.
An Investigation into the Factors which Affect Osmosis Osmosis is defined as the movement of water molecules from a higher concentration to a lower concentration through a partially permable membrane. Osmosis occurs with molecule moving in and out, these molecules move across the plant’s cell membrane. The plant’s cell membrane is partially permable and therefore it has small holes in it which allow for small water molecules to pass through it however larger molecules such as glucose through. However on the out side of the plant cells there is a cell wall of cellulose that has larger holes that let anything pass through it. This cell wall is totally permeable and therefore will allow larger molecules such as glucose through it, but the larger molecules can still not pass the cell membrane.
Water has a high specific heat, which is important inside cells where metabolic reactions are enzyme controlled and externally to provide a constant environment for aquatic organisms. High latent heat, which is significant in temperature control where heat is used for vaporization of water when sweating. Water’s maximum density is at 4 c. As water-cools the density increases. When water is in a liquid state the hydrogen bonds are weak and can break easily because molecules move about. When water freezes, the water molecules are no longer free to move and the hydrogen bonds are permanently formed.
Lab Report Testing the Effects of Changing Surcrose Concentration on Osmosis in Plant Cells Aim To investigate the effects of changing the sucrose concentration on osmosis in plant cells. Plan Water passes into cells through a special type of diffusion called osmosis. Water molecules diffuse through the membrane from a weak solution into a strong solution until the concentration is the same on both sides. A membrane that allows only certain molecules to pass through is called a semi-permeable membrane. In a plant, water passes from a weak cell sap solution to an adjoining cell with a stronger solution, as water passes in, the volume of the sap vacuole increases.
Background Knowledge: Osmosis definition: Diffusion of water molecules through a semi permeable membrane from a higher concentration to a lower concentration until the concentration on both sides is equal. Osmosis in animal cells: The cell membrane is the partially permeable membrane in animal cells. If the cells were placed in distilled water they gain water, swell and burst. This is known as haemolysis. Osmosis in plant cells: The cellulose cell wall of plant cells is fully permeable.
2. Would a 2% solution of NaCl cause a red blood cell to crenate (shrink) or swell? Explain your answer. Osmosis is a type of passive transport where water molecules pass through a selectively permeable membrane from an area of greater concentration to an area of lesser concentration. This is basically achieved because of the random movement of the membrane lipid thereby opening small gaps between the wiggling tails of the lipid bilayer and the transmembrane proteins which are water specific called the aquaporins which allow water molecules to pass through the plasma membrane.
Nachaiyasit and Stuckey (1997) studied the effect of organic and hydraulic load on an anaerobic baffled reactor and observed significant differences in reactor performance in both cases. While the increase in OLR can trigger microbial growth, low OLR can cause starvation. So, the increase in OLR can be used as a means to increase biogas production rate. However, the response of each trophic group to change in loading condition should be taken into account. For maintenance of reactor stability, proper balance between each trophic group of microbial communities is very important.