Cell Wall Transport Essay

907 words - 4 pages

Part 1 - Diffusion through an Artificial MembranePurposeThis experiment will demonstrate differential permeability in the model cell.HypothesisBecause iodine is much smaller than starch, Iodine solution will move through the membrane but starch will not.MethodPrepare iodine solution in jar. Pore glucose solution and starch solution into membrane bag. Gently set the bag in the iodine solution. Observe and check for color changes. Iodine molecules in the solution (orange) will flow by diffusion through the pores in the bag to the inside, where there is no iodine yet (flow is from concentrated to dilute). When iodine bumps into cornstarch molecules, they react to make the dark blue complex.Results Iodine solution Glucose/starch solutionbefore yellow whiteafter yellow green blueConclusionIn dialysis, small molecules pass through a membrane by diffusion. It is like dust blowing through a screen window while keeping bugs out. Diffusion also predicts which direction the molecules will move, which is from more concentrated to more dilute areas. Here a plastic bag was the membrane. Iodine, starch, glucose and water were the molecules. Starch and iodine combine to make a dark blue product and this was the visual test of your model. Iodine solution was able to move through the membrane but starch was not because iodine is much smaller than starchPart 2 - Diffusion at Different TemperaturesPurposeThis experiment will demonstrate the effect of temperature on the rate of diffusion.HypothesisHigher temperature will make diffusion faster.MethodTransfer a few grains of potassium permanganate into three test tubes and fill with distilled water. Place one test tube in each cup. The 3 measuring cups are filled each with the same amount of water, ice and very hat tap water. Measure the level of any color rise up - take 5 measurements.Results Tube in ice Tube in water Tube in hat water3 min 1cm (purple/pink) 2cm (purple) 8cm (purple)6 min 1.5cm (purple/pink) 4cm (purple) 8cm (purple)9 min 1.5cm (purple/pink) 6cm (purple) 8cm (dark purple)12 min 2cm (purple/pink) 7cm (purple) 8cm (dark...

Roots' Function in Life Support System of Plants

1022 words - 4 pages cytoplasm and the vacuole will shrink. The cytoplasm will stop pushing outwards on the cell wall and the cell will become flaccid. Active Transport is defined as the movement of particles from a low concentration to a high concentration using energy. Some solutes have a higher concentration inside the cell than outside so they have to cross the membrane against the concentration gradient. This means they can't get in by

How was the development of specialized compartments in the eukaryotic cell advantageous and what problems needed to be overcome as a result?

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Damn Near Everything There Is To Know About Cells:

1029 words - 4 pages excess water leave. The plasma membrane helps maintain a chemical balance within the cell. Cell wall - The cell wall is an added boundary to the cell. It is relatively inflexible, and surrounds the plasma membrane. The cell wall is much thinker than the plasma membrane and is made of different substances in different organisms. The cells of plants, fungi, almost all bacteria, and some protists have cell walls. Animal cells have no cell walls

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Cell Transport Essay

607 words - 3 pages Cells get things they need inside themselves by transport across their cell membrane. Three types of transport are osmosis, facilitated diffusion, and endocytosis/exocytosis.Osmosis is how cells obtain water, which is what cells are mostly made of. Osmosis is the net movement of water molecules across the cell membrane from high concentration to low concentration or with the gradient. This method doesnt require energy. Water molecules are