2.03 Cell Membranes and Homeostasis Essay

Objective(s) The reason for this experiment is to see how amylum and iodine fall upon all(prenominal) early(a) and how a plastic adhesive friction works correspondent to a membrane in certain situations. Introduction I know prior to doing this experiment that iodine mixed with stiffen creates a unforgiving color and that most objects, organic and inorganic, naturally experience isotonic reactions. supposal I destine that the white potato vine go away absorb more(prenominal) stiffen than the sweet potato and they will both absorb relatively like amounts of water. Procedure Variables Controlled- water and size of potatoes. Manipulated variables- potatoes growth based on table of contents of upshot. DataData and ObservationsBag ContentInitial color of water/iodine solution in the shapeFinal color of the solution in the cup Starch and body of waterDark blue, purple Blackish BlueWaterOrangeyOrangeAnalysis QuestionsPart 11.Restate your surmisal and discuss if the observ ed results supported the hypothesis. -Based off what I observed, my hypothesis, stating that the potato will absorb more amylum than the sweet potato, was correct. 2.Identify the control and variables in your experiment.-Variables Controlled- water and size of potatoes. Manipulated variables- potatoes growth based on contents of solution. 3.Why do we observe the color of the solution before adding the sandwich bags to each cup? -To make sure that the solutions contain the necessary contents. 4.Based on your observations, is the sandwich bag permeable to starch? To iodine? -Iodine is permeable to the sandwich bag, while starch is not. 5.Look up the molecular structures of starch and iodine, and subroutine those structures to explain your observations. -Starch is a more complex compound than iodine, making it easier for iodine to pass finished objects. 6.If a equilibrize was available, describe how you could use it in this experiment and what the purpose would be. -The balance cou ld be used to also see the difference isthe potatoes before and after(prenominal) the observation time. 7.Living organisms ar made of cells.Those cells must receive nutrients and gases in rule to undergo the metabolic processes that maintain homeostasis. In paragraph form, explain how you think the nutrients and gases enter the cell. Distinguish between the atoms that can enter by airing by simply moving across the membrane and those that must shed zip to cross the cell membrane. -Nutrients enter cells in to major ways, through active and hands-off transport. When a molecule uses diffusion or other processes that require no energy, they are using passive transport. An example molecule for this would be water or glucose. Other molecules, that need to use energy to enter a cell use active transport. Many molecules that use this are macromolecules, like proteins. Molecules use one of these cardinal transports to enter a cell. 8.List three criteria cells use to select materials to enter or leave the cell.thence explain the role of each criterion in determining the casing of transport a cell will use for different coat molecules. For instance, small molecules move across the membrane by diffusion, given they are moving with the concentration gradient. -Water can enter the cell in guild to balance the amount inside to the amount of the environment. This is passive due to the position that it happens without any external energy. -Some molecules can pass into the cell by facilitated diffusion. This is passive due to the nature of diffusion and because the solute is moving down its concentration gradient. atomic number 11 is move out of an animal cell while potassium is moved into the cell by the sodium-potassium-pump. This is through active transport because it uses energy.Restate your hypothesis and discuss if the observed results supported the hypothesis. -Based off what I observed, my hypothesis, stating that the potato will absorb more starch than the sweet potato, was correct. 2.Use your observations to explain if each fictitious character of cell (potato, sweet potato/pear/apple) was isotonic, hypertonic, or hypotonic to each of the solutions. Explain what happened to each fictional character of cell in response to the type of solution it was in. - tater- it was hypertonic and gained water in the water solution. In the starch solution, it was hypotonic. -Sweet Potato- it was hypertonic in the water solution and went through plasmolysis in the starch solution. 3.Based on the observed volume changes, which ofthe vegetables/fruits used in this experiment has a greater amount of sucrose in its cells? Explain your answer. -The Sweet Potato seemed to have an originally larger amount of sucrose in its cells. remainder In conclusion, it seems like the hypothesis was relatively correct.From the data collected from the experiment, the two potato samples were subjected to different solutions. The potato was hypertonic to the distil led water and hypotonic to the starch solution. The sweet potato, on the other hand, was a comminuted harder to determine, though it was provable that it was hypertonic to the distilled water, it was hard to determine if it was hypo-,hyper-, or isotonic. Since it was hard, I did a little research and realized that what I was seeing was the sweet potato firing through plasmolysis. This experiment was somewhat difficult due to the fact that I was observing periodically, but it seems like it was a success.