Essay Example on Introduction Cells are held together by a lipid bilayer membrane

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Introduction Cells are held together by a lipid bilayer membrane which is semipermeable that regulates what can come in and out of the cell In this experiment I will be observing how different substances use passive transport across the membrane Osmosis is simply the movement of water across a membrane The water moves across the membrane depending on the concentration of the substance inside and outside of the cell membrane Objective Observe osmosis in an egg cell In this activity I will conduct a simple experiment with eggs vinegar water and corn syrup in order to understand the principle of osmosis Question How do different solutions affect the movement of water across an egg s cell membrane What do you think will happen when the egg is placed into corn syrup What about tap water Hypothesis I think that both of the eggs will grow when they are placed in vinegar and lose their shells The one that always stays in vinegar will continue growing until it bursts or until the experiment is over and the egg is removed from the vinegar The other egg will then lose weight in corn syrup and it will gain some weight when it is put into the water Materials 1 One raw egg experiment one raw egg control 2 Kitchen scale 3 2 large wide mouth glass jars 4 Vinegar 5 Tap water 6 Corn syrup 7 Labeling Tape 8 Permanent marker 9 1 Plastic spoon 10 Paper towels Procedure 1 I will put both eggs in enough vinegar to cover each egg 2 



After two days I will measure the mass of each egg and put one egg back into the vinegar and the other one into enough corn syrup to cover it 3 After one more day I will take both eggs out measure their mass 4 I then put the one that was in vinegar back into vinegar and the one that was in corn syrup into tap water 5 Then I measure the mass of each egg and that would be the end of the experiment Data Data Chart 1 Experimental Egg Day Egg Mass g Substance before the mass Observations 1 86g Vinegar The egg gained mass and lost its shell 2 41g Corn Syrup The egg lost mass 3 78g Tap Water The egg gained mass Data Chart 2 Control Egg Day Egg Mass g Substance Observations 1 76g Vinegar The egg gained mass and lost its shell 2 86g Vinegar The egg gained mas 3 90g Vinegar The egg gained mass Analysis This process that the control egg went through was diffusion where the water moves from an area of high concentration to an area of low concentration I believe that the solution diffused until it was an isotonic solution because it didn t go through cytolysis when a cell ruptures due to too much water in the cell The other egg was in a hypotonic solution when it was in vinegar a hypertonic solution when it was in corn syrup and a hypotonic solution Neither of the eggs stayed in the hypotonic solutions long enough for them to experience cytolysis In this experiment my hypothesis was proven to be positive Both of the eggs were much bigger than they were when I took them out of the vinegar and than they were before I put them in

After taking the eggs out of the vinegar I noticed that the shell had dissolved and I was able to rub off the little remains of shell on the egg I think that this step in the experiment was necessary because to see how the vinegar would affect the eggs and how the outcome of putting the eggs in vinegar differs from putting the egg in corn syrup The egg after it went into corn syrup looked very deflated and the yolk when I touched it was very hard I think that the egg looks deflated because the corn syrup is less concentrated and the water inside the egg left the egg so the egg cell starts to shrivel and deflate The egg from the tap water is similar to the egg when it was in corn syrup because the yolk is still hard but the egg is once again inflated with water This happens because the egg was put in a hypotonic solution which in this case was water so when the egg was put in water the egg absorbed the water and got more heavy I think that this egg looks like this because the hypotonic solution outside of it was absorbed into the egg so it was inflated and looked more like it did after I took it out of the vinegar 



Each of the times that I took the egg out of the water they either increased or decreased in weight but no matter what this happened because of osmosis which is the diffusion of water through a semipermeable membrane Since diffusion is a type of passive transport the movement of substances from an area of higher concentration to a lower concentration which in this case was water Conclusion This process that the control egg went through was diffusion where the water moves from an area of high concentration to an area of low concentration I believe that the solution diffused until it was an isotonic solution because it didn t go through cytolysis when a cell ruptures due to too much water in the cell The other egg was in a hypotonic solution when it was in vinegar a hypertonic solution when it was in corn syrup and a hypotonic solution Neither of the eggs stayed in the hypotonic solutions long enough for them to experience cytolysis In this experiment my hypothesis was proven to be positive


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