When a cell membrane is said to be selectively permeable, it means that the cell membrane controls what substances pass in and out through the membrane. This characteristic of cell membranes plays a great role in passive transport. Passive transport is the movement of substances across the cell membrane without any input of energy by the cell. The energy for passive transport comes entirely from kinetic energy that the molecules have.
Order now Water appears to cross the differentially permeable membrane of potato cells by a process called osmosis. During seven-lab experiments our class found that when we soak a potato and a prune in ODL water it will gain weight but if we soak a potato in Nasal solution it will lose weight but a prune soaked in Nasal solution will gain weight just as it did in the ODL water.
All cells contain membranes, which are selectively permeable, allowing things to pass in and out of the cell. The process which molecules of a substance move from areas of high concentration to low concentration is called diffusion. Osmosis is the process in which water crosses membranes from regions of high concentration to low concentration.
While molecules in diffusion move down a concentration gradient, molecules during osmosis move both down and across a concentration gradient.
Osmosis and diffusion are both types of passive transport that do not require help. I hypothesize that the potato and prune in the Nasal solution will lose weight, whereas the potato and prune in the ODL water will gain weight.
In the osmosis lab we started by taking two potato slices, approximately the same size and dipped them in to water and weighed them each individually n an electronic balance and recorded the weight. Then we placed one piece in ODL water and the other piece in saturated Nasal for about 20 minutes.Oct 31, · Lab Report Osmosis - Free download as Word Doc .doc /.docx), PDF File .pdf), Text File .txt) or read online for free.
Scribd is the world's largest social reading and publishing site. Search Search/5(6).
Osmosis Lab Report. Osmosis is the best way to perform this experiment because as we went through the experiment, the weight of the beaker/dialysis tubing changed and the only logical explanation was that diffusion of water had occurred.
Osmosis is the diffusion of water. Depending on which was heavier (the beaker or the dialysis tubing. Lab Report on Osmosis and Diffusion Essay Lab Report on Osmosis and Diffusion Biology 1, Period 3 March 15, Lab Team: Jason Perez, Kicia Long, Chris McLemore Purpose: The purpose of this lab is to observe the acts of passive transport: diffusion and osmosis in a model membrane system.
|Recent Posts||Hire Writer The opposite would occur as well, if the concentration of sucrose in the elution is more than that of the potato, then the potato would expand and gain in mass. In conducting this as an experiment, we can determine what the solute concentration of potatoes is.|
|Lab Report 1 - Osmosis - Biology Lab Notebook||However, these results may be inaccurate due to many sources of error that will later be discussed.|
If the two solutions are of equal concentrations, they will be isotonic. If the concentrations are unequal, the solution with the higher concentration is hypersonic, and the solution with the lower concentration is .
Water appears to cross the differentially permeable membrane of potato cells by a process called osmosis. During seven-lab experiments our class found that when we soak a potato and a prune in ODL water it will gain weight but if we soak a potato in Nasal solution it will lose weight but a prune soaked.
Osmosis 2 OSMOSIS INTRODUCTION: By definition, osmosis is the diffusion, or dispersion, of water through a selectively permeable membrane from a higher concentration to a lower concentration (Campbell, pg).