Membrane Physiology And Cell Structure

1181 words - 5 pages

Intro Sample...


The cell membrane is a fluid structure that is made up of phospholipids and proteins. Its main function is to allow osmosis and diffusion to occur in a cell. It protects a cell from taking in molecules that are too large and other chemicals that are not permeable without energy being used. The cell membrane is considered to be selectively permeable because it does not allow the non-fat soluble chemicals and the larger molecules in, but it does allow fat soluble chemicals and small molecules to pass into the cell. In order for the larger molecules and non-fat chemicals to enter the cell protein channels and energy are needed. In this lab you will see the cell membrane working. The experiment will show the Osmosis of water and a... View More »

Body Sample...


In bag 2 the mass changed 4.4 grams. In bag 3 the mass changed 6.3 grams. In bag 4 the mass changed 8.3 grams, and in bag 5 the mass changed to a negative 6.0 grams.

Part B: The methylene blue diffused through the agar gel a total of 4.5 mm and the potassium permanganate diffused 10.5 mm. The potassium permanganate diffused through the water a total of 15 mm.

Part C: The solutions in the bag contained starch, which caused the solution to turn black. Sulfate ions and proteins were not found. Chloride ions were found in the solution, the solution turned into an orange-milky color. The solutions in the beaker contained no starch. There were sulfate ions found, which caused the solution to have white particles floating in it. Chloride was found in the solution, the solution turned into a yellow color. The beaker also contained proteins, the color of the solution turned to a violet color.

Discussion and Conclusion

The findings for Part A backed up my hypothesis. Bags 2 through 4 did have a Hypotonic solution. The 5th bag's solution was Hypertonic and bag 1 involved an Isotonic solution. The relationship between sucrose solution and osmosis is that the higher the sucrose solution the faster osmosis occurs. The water molecules are moving faster through the sucrose solution so that equilibrium is met in the cell and surrounding solution. The water for bags 2 through 4 are moving into the dialysis tubing, that is why the dialysis tubing expanded and had a Hypotonic solution. For bag 5 the water was moving out of the dialysis tubing into the ...

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