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Diffusion is vital to many life functions of a cell, it allow the transportation of vitally important nutrients and compounds without the expenditure of excess metabolic energy.
To explain diffusion, it is as if a bottle of perfume is opened at one end of the room, then in a short amount of time a person at the other end of the room can detect the scent of the perfume; this is the process of diffusion.
Diffusion is a movement from a higher concentration to a lower concentration. A special kind of diffusion is known as osmosis, osmosis is fundamental in many industrial processes such a water purification, desalination, and waste material treatment.
Osmosis is when water is separated by a selectively permeable membrane, with different solute concentrations on either side of the membrane.
In osmosis water is moved from regions of low concentration to regions of high solute concentration. Osmosis also has a major impact on living cells.
When the two solutions on either sides of the membrane are equal and no net movement is detected, the solutions are isotonic.
This means that the solutions have the same concentration of solutes. If two solutions differ in the concentration of solutes that each has, the one with more solute is hypertonic. The solution that has less solute is hypotonic. Water potential determines the direction and rate of osmosis.
Water potential consists of pressure potential, which is the exertion of pressure on a solution, and osmotic potential, which is the relative concentration of solutes within the two solutions.
Diffusion and osmosis occur between different molar solutions until the solutions are isotonic, effecting the pressure of the plant cells. In this experiment my group used the following materials: Then we obtained a piece of dialysis tubing that has been soaking in water, and we tied a knot in one end of the tubing.
Then recorded the color of the solution in the bag and noted it in Table 1 in the Analysis section.
After, we then determined if glucose was present in the tubing by dipping one of the glucose indicator strips into the solution and then recorded the data in Table 1.
Afterward we then carefully tied a knot at the open end of the bag, but left enough space in the bag for expansion.
After that we determined if glucose was present by dipping another glucose strip into the solution in the beaker and recorded the data in Table 1. Then we immersed the dialysis bag completely in the solution and waited 30 minutes.
Then we removed the dialysis bag from the cup and recorded the final color of the solutions in the bag and the cup in Table 1. Using glucose indicator strips we then determined the glucose content in both the beaker and the dialysis bag.
Finally we recorded the presence of absence of glucose in Table 1. My group obtained six plastic cups and labeled them as follows: Then we obtained six pieces of dialysis tubing from the beaker of water and tied a knot in one end of the tubing.
Afteer, we opened one piece of dialysis and poured 25 ml of distilled water into the tubing and then tied of the other end securely leaving room for expansion. Then we repeated the same process witht eh remaining five pieces of dialysis tubing, adding a different sucrose solution to each bag: Then filled the six plastic cups approximately?
After waiting 30 minutes, we removed the bags from the cups, dried them and weighed each bag once again recording the final mass of each bag in Table 2. Part C, Water potential: Then we poured ml of one olution we were assigned into a plastic cup and took the initial temperature and recorded it in Table 3.
Then we inserted four potato cylinders and cover the cup and let it stand overnight.
The following day, we measured the final temperature of the liquid in the cups ad recorded the data in Table 3. After removing the four cylinders from each cup, we blotted them dry and weighed them, recording their final mass in Table 3. We then calculated the percent change in mass for the four cylindrs using the formula: Part D, Water potential calculation: We determined the solute potential of the sucrose solution, the pressure potential, and the water potential.Ap biology diffusion and osmosis lab conclusion essay Essay on the origin of language herder dog list of quotes that can be used in essays exemple de dissertation de philosophie sur le bonheur tragic hero essay death of a salesman pdf brozel macbeth analysis essays.
Essay Ap biology diffusion and osmosis lab conclusion essay. Osmosis is the diffusion of water through a selectively permeable membrane from a region in which it is highly concentrated to an area that has a lower concentration. Cells use diffusion in order to perform simple tasks.
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AP: LAB-RELATED AP EXAM ESSAYS LAB 1. OSMOSIS AND DIFFUSION ESSAY A laboratory assistant prepared solutions of M, M, M, and M sucrose, but forgot Name _____ AP Biology 2 of 16 LAB 2.
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