STANDARD 1. CELL STRUCTURE andORGANIZATION IN LIVING THINGS
STANDARD 2.CELL MEMBRANE
A. Describe the structure and function of each part of the cell membrane and label each part in a diagram: phospholipid, carbohydrate chain, integral proteins, peripheral proteins, cholesterol
B. Explain why the cell membrane can be described as both a fluid mosaic model and a semipermeable structure
STANDARD 3.PASSIVE TRANSPORT
A. Given a scenario, predict the occurrence of diffusion and compare observations to predictions in a lab setting
B. Apply the terms hypertonic, hypotonic and isotonic to examples of osmosis in a cell
C. Using labeled diagrams, predict the direction of osmosis and the resulting effects on animal and plant cells.
D. Explain the concept of passive transport and distinguish between the three types
STANDARD 4.ACTIVE TRANSPORT
A. Define active transport and relate it to the processes of endocytosis and exocytosis
B. Compare facilitated diffusion to protein pumps
C. Distinguish between passive and active transport, both in words and using diagrams.
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GCSE Biology Osmosis Coursework Potato and Osmosis Investigation Introduction into Osmosis Osmosis is a unique type of diffusion. Diffusion is basically the movement of particles from areas where there are a groups of them to places where there are fewer a bit like someone releasing methane, you do not smell it straight it but it gradually spreads out then it is equally balanced having reached equilibrium Nice air Bad smell Osmosis is defined as the movement of water molecules from a region that they are highly concentrated to a region in which they are less concentrated. This movement only takes place through a partially permeable membrane such as a cell wall, which lets small molecules go through like water but does not let bigger molecules to pass through like sugar. The water molecules pass both ways. In this diagram, the water will more likely go right. Diagram of Osmosis Plant cells always have a strong cell wall surrounding them. When they obtain water by osmosis they commence to swell but the cell wall prevents them from bursting. If it were an animal cell, it would rupture because it does not have a cell wall. Plant cells become turgid when they are in dilute solutions. Turgid means inflated and firm. If these potato strips were placed in a solution with a low water concentration, then the opposite would happen. Water would shift out of the cell into the solution. If the situation was fatal, the cell membrane would leave the cell wall and the cell is now to be known as plasmolysed or flaccid. . read more.
To make sure that this experiment is safe I will take certain measures including: * wear goggles for the protection of my eyes * cover up any cuts * no running around the lab which may cause fatal accidents * if a spill has occurred make sure it has been cleaned straight away * be careful with the knife * also be careful with the borer * every stool, bags and coats be underneath the table * not to leave any experiments unattended Preliminary Method I will gather all equipment that will be needed for the experiment. Solutions - these are the solutions, which will be in each of the beakers. 1. 1 molar sugar solution with 200 ml of water 2. 0.75 molar sugar solution with 200 ml of water 3. 0.50 molar sugar solution with 200 ml of water 4. 0.25 molar sugar solution with 200 ml of water 5. Only pure water which consists of 200 ml of water Systematic Method 1. Using a knife, I will peel five potatoes 2. Using the borer, I will bore holes in the potato. 3. Using the scale, I will weigh the tubes and record it. 4. I will put all of the tubes in with the solutions at the same time. The time limit will be ten minutes. 5. In the end, I will take all the tubes out from beakers, remove excess water, and weigh. Results of Preliminary Method Solution Number Mass Before Grams Mass After Grams Percentage Change % 1 15.801 15.611 1.3 2 15.838 15.343 - 3.1 3 . read more.
This would allow more osmosis to happen and I would be able to find the isotonic points of the experiments more accurately as the one I had made is very rough. For weighing of each potato piece, I could have measured it on a more accurate scale like 0.000 instead of 0.00 But I also may decide to change the plant tissue to a cucumber or carrot. One thing I found hard during the investigation was the cutting of the potato pieces, if one piece was different from the others then osmosis taking place in each piece may have been at different rates, as the surface area would have been affected. So to improve accuracy, I may try to use some sort of machine like a potato peeler and cutter from a fast food store. This would mean every potato piece would be the same mass making it a fairer test. Throughout the experiment, I used a measuring cylinder, which is not always precisely accurate. I could have used a burette or a titration. One other thing was that when I removed excess water from the potatoes after the experimentation, I might have removed more excess water than others. So in the future, I may find another answer to drying like a hair blow dryer. Overall, even though I may say so myself, the investigation of my main method was very successful. Also, I was pleased with the comparison between my prediction and main method. I had a number of results from which I was able to make very useful graphs. GCSE Biology Osmosis Coursework By Lekhraj Newoor. 1 . read more.
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If you were requested to produce a list of the foremost challenging assignments, a Biology coursework on osmosis would stand within the beginning of the list. This particular article is made for those people fortunate college students who’ve not faced this job but (it will be basically inevitable) and for individuals who really have to craft this semester their Biology coursework on some tricky method like osmosis.Definition of osmosis
The first point you’ll need to do as part of your Biology coursework on osmosis is always to present your deep idea of the nature of this approach. Osmosis is regarded as a chaotic movement of h2o through the area accompanied by a somewhat lower solute focus with the region by having a larger degree of solute focus. Biology courseworks on osmosis must be influenced by the theory of physics, biology and chemistry, consequently it’s essential to have some expertise in every of those courses.
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Osmosis is defined as ÃÂ¡ÃÂ§the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentrationÃÂ¡ÃÂ¨.
In a high concentration of water the amount of solute (e.g. sugar) is low. This could be called a weak or dilute solution. In a low concentration of water the amount of solute (e.g. sucrose) is high. This could be called a strong or concentrated solution. When two such solutions are divided by a semi-permeable membrane the water will move from the area of high concentration to the area of low concentration, until both sides are equal (have reached equilibrium).
Knowing that osmosis will occur across a semi-permeable membrane whenever there is a difference between the water concentrations on the two sides of the membrane, and knowing that when this happens to cells they will either become turgid if water flows into them, or plasmolysed if water flows out of them, and thus change their volume, we want to test the hypothesis that:
If the concentration of a solution into which a cylinder of potato is placed is greater than a certain level the cylinder will contract, and if the concentration is less than that level it will expand.
This can be seen in living cells. The cell membrane in cells is semi-permeable and the vacuole contains a sugar/salt solution. So when a cell is placed in distilled water (high water concentration) water will move across the semi-permeable membrane into the cell (lower water concentration) by osmosis, making the cell swell. This cell is now referred to as turgid. If done with potato cells the cells would increase in length volume and mass because of the extra water. If these potato cells were placed in a solution with a low water.Citation styles:
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