Biology Membrane Lab - Free Essay Example

Sample details Pages: 2 Words: 528 Downloads: 8 Date added: 2017/09/19 Category Biology Essay Type Argumentative essay Did you like this example? Introduction: In this lab i used glucose and starch to show if the cell membrane is permeable, impermeable, or selectively permeable to these substances. Dialysis tubing is a plastic like substance that has small pores in it. These pores allow certain chemicals to flow into and out of the cells. The size of the molecule determines what goes through the tubing. On of the materials that we will be using is glucose. glucose is a simple sugar that easily dissolves in water. To test for the presence of glucose we will use glucose test strips. The strip will change from an aqua blue color to a brown color if there is glucose in the solution. Starch is a complex molecule that forms from a suspension in the water. To test for the presence of starch I will use Lugols iodin. When it comes in contact with the water and turns black or blue thats how you know that starch is present. Hypothesis: We tested the cell membrane to see if it was permeable or impermeable to glucose, and starch . I predicted that The cell membrane will be impermeable to starch. It would be impermeable to starch because the dialysis tubing has small pores but the starch molecules are too big to fit through. The cell membrane will be permeable to glucose because the glucose molecules are are smaller than the pores in the dialysis tubing. Methods and Materials: The materials that we used are 2 cups, 2 pieces of dialysis tubing, water, glucose, glucose test strips, scales, lugols iodine, and a pipette. We tied one end of the glucose tubing, and put 2 inches of glucose solution into it then we tied the other side into a knot to close it up. With the second dialysis tube we did the same thing but with the starch solution. We then weighed the glucose cell, then the starch cell, and recorded the mass into the chart. After that we placed each cell into a seperate cup, and filled it with water. We let the cells sit in the cups overnight. The next day we got our cup with the glucose cell, we to ok a glucose test strip and dipped it into the water in the cup to test for glucose. Then we took the cell out of the water, weighed it, and recorded it in the chart. We took the cup with the starch cell and tested it for starch by using lugols iodine. We put 4 drops of the iodine into the cup. We took the starch cell and weighed it, then recorded it. Mass of Glucose and Starch Results: When I got my cups i got the glucose test strips and the iodine to test for the substances of starch and glucose. When we tested the glucose cell with the test strip it chaged to a brownish color. This means that glucose was present. When we put iodine into the cup that had the starch cell in it it didnt change to a black color, so this means that starch wasnt present. We then cut open the starch cell and the water turned black, and that showed us that starch was present. Don’t waste time! Our writers will create an original "Biology Membrane Lab" essay for you Create order

Jane Eyre - Miss Temples Influence on Jane - 961 Words

Jane Eyre is set during the Victorian period, at a time where a womens role in society was restrictive and repressive and class differences distinct. A job as a governess was one of the only few respectable positions available to the educated but impoverished single women. br brNot only is Jane Eyre a novel about one womans journey through life, but Brontà « also conveys to the reader the social injustices of the period, such as poverty, lack of universal education and sexual inequality. Janes plight and her dependent status is particularly emphasised at the beginning of the novel. br brMiss Temple is the kind and fair-minded superintendent of Lowood School, who plays an important role in the emotional development of Jane†¦show more content†¦br brJane admits to her instruction I owed the best part of my acquirements; her friendship and society and been my continual solace; she had stood me in the stead of mother, governess, and latterly, companion. br brMiss Temples treatment of Helen also has an influence on Jane. Jane has a great deal of admiration for Miss Temple, and in many ways copies her behaviour. Miss Temples treatment of Helen shows Jane how to treat other people, with kindness and respect. br brWhen Miss Temple invites Jane and Helen for tea, Jane listens enraptured to Helens and Miss Temples intellectual discussion, while observing a real warmth and affinity between them. It is clear to Jane that both Miss Temple and Helen are both very intelligent and well read, Jane admires these qualities and tries to seek them herself as they lead to an independence of mind, another quality that Jane wishes to acquire. br brThe extent of Miss Temples influence on Jane can be seen by the way she reacts to Miss Temples departure, from the day she left I was no longer the same: with her was gone every settled feeling that made Lowood in some degree a home to me and without the presence of Miss Temple there to guide her she feels that the reason to be tranquil was no more. br brMiss Temple acts as a strong role model to Jane, and holds the qualities which Jane aspires to have: kindness, sensitivity to the sufferings of others andShow MoreRelatedFeminism in Jane Eyre Essay1648 Words   |  7 Pages Jane Eyre was written in a time where the Bildungsroman was a common form of literature. 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With Courage, One’s Life Is Ruled by Fear Free Essays

Without courage, one’s life is ruled by fear. Discuss. Without courage, one’s life is ruled by fear. We will write a custom essay sample on With Courage, One’s Life Is Ruled by Fear or any similar topic only for you Order Now Fear is one of the most powerful emotions human beings know, it can motivate people to do incredible things. In the movie; â€Å"The Power of One† there are many that, due to the apartheid in South Africa and in the ignorant racism, lack courage. Courage is a quality that enables a person to look beyond the immediate danger and assess the possible outcomes in order to make the decision to act and achieve the desired outcome. The main character of ‘The Power of One’, P. K is sent to an Afrikaner boarding school because his mother suffers a mental breakdown. At the school, P. K is the only English boy, and seeing as the English drove the Afrikaners out of power in South Africa, they blame him for everything and P. K begins to wet the bed at night out of fear. P. K. confides in Nanny that he is wetting the bed. Nanny calls a medicine man that is said to, â€Å"make sick men well and scared men brave. The medicine man helps P. K. face his fears and overcome them. Nanny gives P. K. a chicken to take back to school, and P. K names the chicken, ‘Mother Courage’ this is a major symbol in the fact that it represents P. K’s courage and being able to overcome the fear of the other kids. P. K. gets sent to live with his grandfather who runs an Afrikaner prison. One of his grandfather’s friends Doc is asked to look after P. K. Doc is moved into a prison and P. K. goes with him and in prison P. K meets a man named Geel Piet who teaches him how to box and gives him strength, courage and power with his quote; â€Å"Little beat big when little smart, first with the head, and then with the heart. † The Afrikaner prison is riddled with fear from the African inmates towards the guards who beat them and treat them like dirt just to exert the authority given to them and to get across a point that whites are supreme compared to the blacks or considered a higher class of people. P. K gives the inmates courage to sing in their native language about the guards and how they no longer fear them. Geel Piet is confronted by a guard about what the inmates are singing about and just before the guard beats him to death, Piet musters the courage to stand up to the guard and be a free man. Without courage, one’s life is ruled by fear. Every one of us has courage in large amounts but it is squashed with those that are given unreasonable authority and fear an uprise. We all have courage, but sometimes it takes other people or influences such as, life threatening situations, for us to stand up and embrace the courage given to us. Without this, one’s life is ruled by fear. By Jarryd Mckellar. How to cite With Courage, One’s Life Is Ruled by Fear, Essays