A selectively membrane means that the cell membrane can only control over certain things Essay Example for Free

A selectively membrane means that the cell membrane can only control over certain things Essay Osmosis is the diffusion of water through a selectively permeable membrane. A selectively membrane means that the cell membrane can only control over certain things that come in and out through the membrane. A membrane is just the structure surrounding the cell. Throughout osmosis, the cell could either get larger, or smaller. If the cell gets larger it means that it was put into a hypotonic solution, and result to the cell exploding. If the cell gets smaller, it means it was put in a hypotonic solution. If nothing happens to the cell, that means it was put in an isotonic solution. Once a cell starts to get smaller, it will shrivel. The difference between osmosis and diffusion is that diffusion is the process by which molecules move from an area of high concentration to an area of low concentration. Methods: To test, and see the difference between osmosis and diffusion, my group and I conducted three different labs. The first lab we had completed was one where you put an Elodea leaf under the microscope. As step one we put it on a microscope slide, put a few drops of water on top of it, and observed it under the microscope. As step two, we put a few drops of salted water on the leaf, and observed it underneath the microscope. Then we compared the differences in the leaf before and after. After looking at the two different images, it was clear that osmosis had taken place. The leaf in the salt water had become more shriveled; you could also see it a lot better, obvious that something had taken place. The second lab that we had done involved carrots, and took three days to complete. We first got two cups and filled them halfway with water, in one of them we out one tablespoon of salt. After labeling the salted cup, we then took two carrots. On each carrot we tied a piece of string to it, and soaking each of them in the water. Before we could put either of the carrots into a cup, we described the textures of them. We then put Carrot 1 into the water, while Carrot B went into the salted water. After about three days, we went back and got the carrots out of the water. Some of the observations we had noticed was that Carrot 1 had gotten sturdier, much harder. Carrot 2 on the other hand had gotten rough spots, and pretty bendy overall. Both of the carrots had gotten bigger. Knowing that osmosis had taken place, the task was now to figure out if it was hypertonic, or hypotonic. Knowing that Carrot 1 had gotten bigger, and much firmer, we knew that hypotonic osmosis had taken place. Since Carrot 2 was supposed to get smaller, we assumed that hypertonic osmosis had taken place, because the carrot was supposed to shrink and get smaller, meaning that the salt would’ve pulled out the natural waters in Carrot 2. The third lab we had done we tested the amount of glucose that would have diffused out of the baggie. First we took a graduated cylinder and poured 15ml of prepared glucose into it. Next we took a dialysis tube that had been soaking in water and tied a knot in one end. With the unknotted end, we carefully poured the 15ml of glucose in. After tying a knot in the open end, noting the coloring of the bag, determining if glucose was present in the tube using an indicator strip and seeing that there wasn’t any we went ahead and put 250 ml of distilled water along with one ml of potassium iodide (IKI) and the dialysis bag into our beaker. Once we had noted that inside of the dialysis bag it was clear, the beaker was brown because of the IKI, and that there was glucose inside of the dialysis bag, but not the beaker, we were ready to wait 30 minutes to move onto the next set of steps. After the long 30 minutes, we removed the dialysis bag from the beaker. Next we recorded data from the dialysis bag which was sugar, and glucose present. The color went from clear to a light blue, and there was still glucose present. The data from the beaker had also changed, the color had stayed the same, but the glucose present had changed, because in the beginning the beaker didn’t have any glucose, but now the distilled water had some. We knew that the glucose from the dialysis bag, had come out and into the beaker, and we knew that it had to be through diffusion because it wasn’t just water in the beaker. Results: In doing these three labs, we had learned the difference between osmosis and diffusion and we had also learned some very important vocabulary. For our first lab we had done, with the leaf, we had learned that osmosis had taken place, and because of osmosis, the leaf had expanded a lot. The leaf became more visible underneath the microscope, but with the naked eye, it had become a lot smaller, and shriveled. In this lab hypertonic osmosis had taken place, because the salt from the salt water had brought the natural waters out of the leaf, and before you knew it the leaf under the microscope was much smaller. In our second lab we had discovered that both of the carrots went through a phase of osmosis. Carrot 1 had gone through hypotonic osmosis, where the water goes through the cell membrane. The water moves from the outside in, which explains why the carrot was bigger, and why it was much more firm than Carrot 2 which had gone through hypertonic osmosis, meaning that the salt in the cup/beaker had gone through the cell membrane, and basically soaked up the natural water in the carrot, and transferring it into the water inside the cup causing for the carrot to be shriveled up and smaller. In our third lab, we had saw diffusion for the first time. It is almost just like osmosis, except osmosis is only water and salts, and sugars. In this lab we had used potassium iodide in the water, making it not only water. The experiment had gone well, and we got the results we had wanted. The thin dialysis bag had a certain amount of sugar in it, while the beaker it was laying in had absolutely none. In the end, the beaker had shown a significant amount of sugar in it, and because the potassium iodide could not pass through the dialysis bag, the sugar went ahead and came out of the bag, making the process of diffusion complete. Discussion: All three of these labs worked out, and ended pretty well except our second lab, the carrot lab. Our data had shown that the weight after being soaked for three days of the carrots weren’t any different, they had both gained weight. But that had made no sense to us because the carrot that was in the salt water should’ve shrunk and not gained weight. Some of the errors that could’ve gone wrong were that we may not have put enough salt in the cup for anything to actually take place. But because we had known what was supposed to happen, we had an idea of what actually happen, and the fact that the characteristics of everything of a shrunken cell had taken place, besides the fact that the carrot had gained a little bit of weight. References: Lab Worksheets. Crazy Carrots Cellular Transport Vocabulary AP Bio Lab 1 Osmosis and Diffusion Lab Activity Elodea Leaf Lab Acknowledgements: Thank you Miss. Pagano for teaching me the difference between osmosis and diffusion and for writing up these labs to help my classmates and I understand it better and much easier!

Karl Marx Essays -- essays research papers

Karl Marx was the creator of Marxism and a new type of economy and government. His ideas were appealing to the working class people and emphasized the community rather than the individual. His theories spawned communism and his ideas still remain in effect in some modern day countries. Marx’s ideas originate from his experiences in Europe and his collaboration with Frederich Engels. In addition, Marx's work seems to be more of a criticism of Hegelian and other philosophy, than as a statement of his own philosophy. While Hegel felt that philosophy explained reality, Marx felt that philosophy should be made into reality, a hard thing to do. He thought that one must not just look at and inspect the world, but must try to transform the world, much like Jean Paul Sartre's view that "man must choose what is best for the world; and he will do so." Marx is unique from other philosophers in that he chooses to regard man as an individual, a human being. This is evident in his Economic and Philosophic Manuscripts of 1844. There, he declares that man is a "natural being" who is endowed with "natural [and] vital powers" that "exist in him as aptitudes [and] instincts." Humans simply struggle with nature for the satisfaction of man's needs. From this struggle comes man's awareness of himself as an individual and as something separate from nature. So, he seeks to oppose nature. He sees that...

Relationships with children and young people Essay

Describe how you would establish respectful, professional, relationships with children and young people. It is important to establish respectful and professional relationships with children and young people as a role of a Teaching Assistant. A relationship in which a child trusts and respects their teaching assistant and feels comfortable in their company, will allow you to offer a supportive and caring environment in which the child can learn and develop. Listening is arguably the most important way in which to establish a respectful and professional relationship with a child or young person. By listening to what a child has to say, without interruption, conveys to the child that you are in interested in and values what the child has to say. By not interrupting the child, it shows that their views and opinions are not only respected by you, but are also as important as the views and opinions of you themselves. You should also take an active interest in what the child has to say and an interest in the child themselves. For example, what are their hobbies, their interests, their likes and dislikes? . Children respond to routine and rules and should be made aware of what the rules are and the consequences of breaking rules. By doing this, this will enable you to explain to the child that the punishment they have received for breaking a rule ‘is fair’. Fairness helps to establish respectful relationships. Children are very aware of the concept of fairness and the statement ‘it’s not fair’ is often heard within the classroom. Every child should feel secure and valued no matter of their culture, abilities, sex or race and your interactions with the child or young person should demonstrate this at all times. It is important you establish these ground rules and mutual respect right from the beginning, as well as discuss the factors with the pupils that are important when working together. It is crucial that you start by talking about how you are going to work together and what each person wants to get out of it. By doing this it will help you develop a mutually respectful relationship with the pupils. You must also  remember to be able to adapt your behaviour, and be able to communicate accordingly to every child. It is important that you can demonstrate effective communication skills and show that you are approachable to each individual child or young person you are working with. You need to take into consideration that each child or young person is different and can be at different development stages. It is very important when talking or listening to a child that you maintain eye contact, concentrate on what they are saying and physically lower yourself to their level. This shows the child respect and that you consider them as an equal. Finding out about some of their interests and hobbies will also show them that you are really interested. You should make an effort to learn all children’s names, how to spell them and how to pronounce them. Professionally this is also important; being able to put a face to a name will ensure the child’s safety. Children have a great respect for fairness; ‘it’s not fair’ is a common phrase in the classroom. A way of showing fairness is allowing a child to explain their version of events; again this shows that you are willing to listen. However it is important to be consistent in situations, if two children break the same rule it would be unfair to punish one and not the other, this would result in lack of respect from the children. It would also be unfair if you were to show favouritism, like letting your ‘favourites’ get away with things that you would punish other chi ldren for. Being polite not only shows respect but as an adult being polite is a good role model for the children. Children always have stories to tell and being interested and polite shows them that you have listened to them. Children mimic the behaviour of adults, if you are polite, honest, fair and respectful to children there is more chance that they will be act the same towards you.

The Disney Film Version Of Alice - 1045 Words

The Disney film version of Alice in wonderland when compared to the The novel Alice in wonderland by Carroll Lewis, expresses a variety of changes which can alter ideological values. Disney is well known for taking classic stories and fabricating them for a wider audience. This form of fabrication can be beneficial, especially in regards to creating various messages that are intended to be perceived by audiences. Other instances the changes are small and less note worthy. The images left out by Disney alter the ideologies that are expressed. Much of the Disney film version is quite consistent with the book, with the addition of certain aspects added from Alice through the looking glass. One crucial alteration added to the Disney film version is the implication that Alice created wonderland; â€Å"why in my world cats and rabbits would reside in fancy houses (Disney).† As seen in the first scene when Alice is singing to herself. This crucial addition to the Disney film version of Alice in wonderland changes overall themes of the film. It introduces the stresses Alice is dealing with, and her strategy to cope with these strategies. Alice uses wonderland as a form of escapism to avoid social constructs, which ultimately allows for growth. The pressures of society can apply an overwhelming strain on individuals. In particular, girls. The visual appearance of Alice in the Disney film version is slightly altered from the novel. In the Disney film Alice appears to be a young lady ofShow MoreRelatedEssay about Cinematography1421 Words   |  6 PagesINTRODUCTION Alice in Wonderland released in 2010 is an amazing visual film. The movie clip I have chosen is called, â€Å"Reunited†. This clip is focused on the reunion of Alice and the Mad Hatter after she thought the Mad Hatter was dead, due to the red queen wanting to take off his head. 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