Structure Of Dna Essays - Genetics, Molecular Biology, Nucleic Acids

Structure Of Dna The ?Thread of Life?, is deoxyribonucleic acid, also known as DNA. This molecule which is the bases of life, is spiral shaped and found in the nucleus of cells. DNA has the genetic code for bodies, controls development of embryo's, and is able to repair damage caused to itself. All DNA molecules have linked units called nucleotides. These nucleotides have sub-units that have 5 carbon sugars that are called deoxyribose. DNA is composed of four bases called adenine, thymine, guanine, and cytosine. These are some of the main principles of DNA. What we know today about structure of DNA begins in 1868 when a Swiss biologist Friedrich Miescher did the first experiments on the nuclei of cells. Miescher used the nuclei of pus cells from old medical bandages. In these pus cells he found What We know today about structure of DNA begins in 1868 when a Swiss biologist Friedrich Miescher did the first experiments on the nuclei of cells. Miescher used the nuclei of pus cells from old medical bandages. In these pus cells he found phosphorus with a substance he called nuclein. This nuclein has an acidic portion which is classified as DNA. Another scientist Thomas Hunt Morgan made an important discovery around 1900. He observed that certain characteristics were inherited quickly through numerous generations of fruit flies. So he made the conclusion that these genes must be near one another on the chromosome. In 1943 Oswald Avery, Colin MacLeod, and Maclyn McCarty, three scientists working in the Rockefeller institute, preformed an exper iment by taking DNA from a virulent (disease-causing) strain of Streptococcus pneumonae and transformed a non-virulent (inactive) form back to a virulent form. Avery, MacLeod, and McCarty discovered from their experiments that DNA carried a virulent message that can be transferred into the recipient of non-virulent cells. This proved that DNA was a carrier of genetic information. An important discovery of the 1940's was the discovery by Erwin Chargaff who established that ?heredity's alphabet? which are the four bases adenine (A), guanine (G), thymine (T), and cytosine(C) can occur in different orders in different organisms. In 1953 James Watson and Francis Crick put forth a radical new idea about DNA. Their idea suggested that the DNA molecule was made up of two helical chains instead of three intertwined chains as previously thought. Today we have a strong knowledge of DNA and scientists are applying that knowledge to a three billion dollar project called the human genome project. This project will examine the structure of human DNA and map out every single gene in the human body and will take 15 years. The strong knowledge that we have of DNA allows the scientist to map out the genes at about 1 to 2 per day. This may not seem to be a very fast rate but scientists have already found the genes that cause diseases such as Hunnington's, Lou Gerhig's, and the ?Bubble-Boy? disease. Another way that we use our strong knowledge of DNA is in criminal identification. This plays a major role in today's society. Because each person's DNA is different (except in identical twins) police officers can take blood or semen samples from a crime scene and take them to the lab for identification. This can insure the guilt or innocence of a suspect. An example of this is the O.J. Simpson case where investigators tried to match O.J.'s DNA to the DNA at the scene of the crime. Another way scientists apply their knowledge of DNA today is by using special enzymes called restriction enzymes that cut through the phosphate of DNA and these cut ends are called ?sticky ends? because they easily attract other tails from other DNA. Scientist use these restriction enzymes for genetic engineering by removing a gene from one organism to another. In the future DNA has great possibilities for the betterment of mankind and also the detriment. The most obvious and controversial possibility would be the cloning of humans. Scientists have already cloned sheep and other such organisms but have yet to take the step for cloning a human even though the technology is in place, the ethics of this may not be. The method to arrive at is quite

Prompt Essay Essays

Prompt Essay Essays Prompt Essay Essay Prompt Essay Essay Essay Topic: Claim Of Value Prompt SS 100 WRITING COMMUNICATION Spring 2013 Assignment 1 Persuasive Essay – Section 1 Select one of these prompts write a persuasive essay in which you develop your point of view on the given issue. Support your position with reasoning, facts examples taken from your readings, experiences, or observations. Your persuasive essay should not be a purely research based essay; rather you should aim to convince your audience to your way of thinking through your own logic and reasoning. Your ability to formulate claims use logos, ethos pathos to support your views without any logical fallacies will be assessed. You are required to address the opposition counter it in order to write an un-biased piece. Please ensure that your essay is properly organized, with a thesis statement in the introduction and well-structured paragraphs that are unified coherent. In case you cite research, you must integrate all quotations smoothly, acknowledge the sources and provide a works cited page according to the MLA Citation Style. Prompt 1 Think carefully about the issue presented in the quotation either support or refute the main idea. Affirmative Action programs/ quota systems are meant to redress injustice but instead they cause further injustice. Prompt 2 Think carefully about the issue presented in the quotation either support or refute the main idea. The private lives of politicians should be off limits. The focus should remain entirely on their performance in the public arena. Prompt 3 Take a position on the following claim of policy: Many countries require mandatory military service from their male citizens, for periods ranging from a few months to a few years. Pakistan should also enforce such a policy. Prompt 4 Take a position of the following claim of value: Sport stars can make millions of dollars through endorsements and prize money while individuals working in certain service professions like nursing, teaching etc remain relatively poorly paid. This is an unacceptable distribution of economic rewards. Prompt 5 Think carefully about the issue presented in the following quotation either support or refute the main idea. Social networking sites cause more harm than good to society. Prompt 6 Think carefully about the issue presented in the following quotation and either support or refute the main idea. The international fashion industry’s effects on society are overwhelmingly negative. Word Limit: 1300-1500 words Essay Submission: Hard copy to be submitted in-class Soft copy to be uploaded (log on to LMS, go to the Assignments option select Persuasive Essay upload your essay) Hard soft copy submission = 19th March 2013 (Tuesday) Soft copy submission will remain open till 11:00pm Plagiarism will result in a Failing Grade /or more serious penalties.

Research Methods Essay Example | Topics and Well Written Essays - 1000 words - 3

Research Methods - Essay Example Subjects can either be tested once only (independent group design), or more than once or matched (repeated measures design). The advantages of the latter are that fewer participants are needed (as it may be difficult to find morbidly obese individuals), and this method can provide greater statistical power. On the other hand, there could be practice and carryover effects that would need to be minimised. In the alternative of an independent group design, it may be difficult to randomly assign the subjects and there could be large differences between individuals, which would make it difficult to make any meaningful observations. We would however have the advantage of having a control group so as to control some extraneous factors. Experimental Method Used and its Justification A repeated measures design is preferred due to the expected difficulty in obtaining the required subjects i.e. in finding morbidly obese individuals. They also reduce the effect of individual differences (Schinka, 2003:279). The second justification for a repeated measures design is the greater statistical power relative to the sample size (Amy, 1997). However, subjects will be selected at random and counterbalancing will also be used to offset any practice and carryover effects. The validity of the conclusions is threatened by factors that have either not been specified or included in the study and which could theoretically therefore influence the dependent variable.

Township of Twisted Water Boundary Assignment Example | Topics and Well Written Essays - 1500 words

Township of Twisted Water Boundary - Assignment Example The process used and the allocation limits chosen were published in managing the groundwater resources of the Township of Twisted groundwater management strategy. To decide on the allocation limits, results from an earlier groundwater model (GRFAMOD, Dodson 2001) and the information gathered from the environmental water requirements assessments (SMEC 2001), was used. The GASFAMS groundwater model estimated the recharge, through flow, discharge and storage characteristics of the flow system. The groundwater model simulated a number of recharge scenarios to determine how much water could be sustainably abstracted from the system. The department follows a standard planning process when developing an allocation plan. A component of this process is setting allocation limits and the management regime. For the Township of Twisted area, we set allocation limits in accordance with this process. The yield estimate tells us how much water can be taken from a resource for use and what volume or flow is needed to maintain the ecological and social values, within and downstream of the resource. We also consider management considerations in our decision, such as reliability of supply, current use, future demand and the effects of water abstraction and use on water quality. The department applied this process to the Township of the Twisted alluvial aquifer to determine the allocation limits. An allocation limit is the annual volume of water set aside for consumptive use from a water resource. This includes the water available for licensing and the water set aside for uses exempt from licensing, such as stock and domestic. For administrative purposes, the allocation limit is divided into three groups of components: Involving the community is an important part of the planning process. Extensive consultation should be done to ensure setting the right management approach for the area.  

Gradgrinds system Essay Example for Free

Gradgrinds system Essay In this fifth chapter the readers are certainly convinced of Bitzers unpleasantness because of what he says about horse riders. He says, The horse riders never mind what they say, which shows that he has been affected by Mr.Gradgrinds teaching method in that now he looks down upon anything that is slightly fanciful. This lets the readers know that Mr.Gradgrinds system is failing because although the pupils he is teaching are becoming more intellectual, they are also becoming more devoid of sentiment, and therefore more unkind to others around them. I think that Sissy becomes a much more favoured character in this chapter because she seems innocent and frightened when she says things like, he frightened me so. I think that this is Dickens trying to prove that the more fanciful and spirited character in the book should be treated better and listened to more.  By the last chapter in the second book it is completely clear that Mr.Gradgrinds views have been wrong all along. At this point in the story Louisa has been married to Mr.Bounderby, and Sissy is living with the Gradgrinds. It is obvious throughout the book that Louisa dislikes Mr.Bounderby intensely; however her father never picks up on these emotions. That is why, during this chapter, Louisa breaks down and tells her father how she feels. I think it is significant that Louisa arrives at her fathers house drenched from the storm, as this makes the scene seem more dramatic and her seem in a much greater state of desperation. She says a lot about what she feels and she lets go of all her pent up frustration when she says things like, I curse the hour in which I was born to such a destiny, if you had only neglected me, what a much better and much happier creature I should have been this day, and, What have you done O father, what have you done with the garden that should have bloomed once, in this great wilderness here? These are all very powerful words and I think that it is when Louisa has made all her points that the readers see Mr.Gradgrind for what he really is: not a man who wishes to crush the happiness of anyone he comes into contact with, but a father who loves his children and only has their best interests at heart, regardless of how misguided his ideas on upbringing are. I can tell this because he says things like, my poor child, and, I never knew you were unhappy, my child. The plot outcomes really bring Dickens points of view out into the open as he has shown how the characters that were oppressed by Mr.Gradgrinds system have been destroyed and how the people who stayed true to themselves have succeeded. For instance, Louisa had become the sorry, wretched woman who broke down in front of her father, and Tom has resorted to stealing and deceit. Also Bitzer, who has been brought up alongside Mr.Gradgrinds system has become an unemotional man of facts and figures, who doesnt care for anyones feelings. Sissy on the other hand who had remained kind and spirited for the whole of the story, and who was raised by the circus, becomes a very carefree and happy woman.  Mr.Gradgrind when shown the error of his ways becomes a much more tolerable man and I think the readers respect him for making a change. I think this is how Dickens tries to express the fact that a change in society must be made, and if it were the person who was responsible for the change would be greatly respected and honoured.

New York and the Spanish Influenza :: Influenza Epidemics Health Essays

New York and the Spanish Influenza NEW YORK--Although public health officials, including the Surgeon General, have been reluctant to declare an epidemic of crisis proportions, indications that something more than a mild flu season was at hand began to appear as far back as May when reports from China, the Front lines, and other places around the world, were telling of large numbers of people becoming suddenly ill.1 Few deaths were acknowledged in those early reports and most reports indicated the illness only lasted a few days. Five months later we are seeing something that is quite different. Spanish influenza is spreading faster than health care personnel can treat it. The growing number of people being infected and the dwindling supply of doctors and nurses, already strained by the war, makes it more difficult to treat the sick and thereby slow or stop the spread of the disease. The dynamics of the situation suggests that things are going to get worse before getting better. As early as May and June, there were reports of widespread illness amongst the German soldiers, and later reports in July said that the disease struck so quickly and was so virulent that many German soldiers were dying in the trenches from influenza.2 In Berne, Switzerland, the municipality has forbidden all meetings, including performances in theatres, picture houses, music halls, and concerts. The ban also includes religious ceremonies. Those who ignore the order could face fines and imprisonment.3 It was not until August, however, before officials here in the United States, particularly in New York, expressed any real concern for the latest influenza invasion, which incidentally, did not originate in Spain as the name may suggest. The initial cause for alarm in New York was the discovery of nine cases of influenza aboard a Norwegian vessel that had docked at Quarantine in New York Harbor. Dr. Leland E. Cofer, Health Officer of the Port downplayed the chances of more people b ecoming ill or that the disease would spread; however, the concern was great enough amongst health officials that there was talk of imposing a quarantine in New York.4 When discussing the possibility of a quarantine, Colonel J. M. Kennedy, Medical Corps, U.S.A., Chief Surgeon at the New York port of embarkation, indicated he opposed a quarantine because it would clog the harbor and produce delays in sending troops and supplies overseas, and that the influenza here is not at all dangerous, except when pneumonia develops, and even when pneumonia develops, only a few cases are fatal. New York and the Spanish Influenza :: Influenza Epidemics Health Essays New York and the Spanish Influenza NEW YORK--Although public health officials, including the Surgeon General, have been reluctant to declare an epidemic of crisis proportions, indications that something more than a mild flu season was at hand began to appear as far back as May when reports from China, the Front lines, and other places around the world, were telling of large numbers of people becoming suddenly ill.1 Few deaths were acknowledged in those early reports and most reports indicated the illness only lasted a few days. Five months later we are seeing something that is quite different. Spanish influenza is spreading faster than health care personnel can treat it. The growing number of people being infected and the dwindling supply of doctors and nurses, already strained by the war, makes it more difficult to treat the sick and thereby slow or stop the spread of the disease. The dynamics of the situation suggests that things are going to get worse before getting better. As early as May and June, there were reports of widespread illness amongst the German soldiers, and later reports in July said that the disease struck so quickly and was so virulent that many German soldiers were dying in the trenches from influenza.2 In Berne, Switzerland, the municipality has forbidden all meetings, including performances in theatres, picture houses, music halls, and concerts. The ban also includes religious ceremonies. Those who ignore the order could face fines and imprisonment.3 It was not until August, however, before officials here in the United States, particularly in New York, expressed any real concern for the latest influenza invasion, which incidentally, did not originate in Spain as the name may suggest. The initial cause for alarm in New York was the discovery of nine cases of influenza aboard a Norwegian vessel that had docked at Quarantine in New York Harbor. Dr. Leland E. Cofer, Health Officer of the Port downplayed the chances of more people b ecoming ill or that the disease would spread; however, the concern was great enough amongst health officials that there was talk of imposing a quarantine in New York.4 When discussing the possibility of a quarantine, Colonel J. M. Kennedy, Medical Corps, U.S.A., Chief Surgeon at the New York port of embarkation, indicated he opposed a quarantine because it would clog the harbor and produce delays in sending troops and supplies overseas, and that the influenza here is not at all dangerous, except when pneumonia develops, and even when pneumonia develops, only a few cases are fatal.

Film Opinion Essay

When I decide to drive to the movie theater or to sit down and enjoy a film, several factors play in my choice of movie. Most of the time, it depends on the mood that I am in. Am I in the mood for something light and funny? Or do I want to submerge myself into a detail-oriented film such as Inception? I take into consideration whether I have enjoyed the actors in previous films, and if I think they will provide the entertainment I am looking for. Has the trailer engaged me long enough to make me interested in the film? Or has the advertising flooded me with information that makes me feel as though the film will be another flop and not worth my time? These are all questions I ask myself when I start to think about watching a movie. Generally, I don’t take movie critic reviews into consideration because I have been disappointed several times in the past, but I will listen to what friends have to say about their experience with the movie. I enjoy most films across all genres. I enjoy when the stories are detailed, and provide a history of the characters, whether through flashbacks or dialogue. I prefer comedies to be humorously dark, sarcastic, or dry. With dramas or action flicks, I prefer for the protagonist to have some tragic faults that lead to their outcome or victory to be sweeter or to justify a better cause than them. I enjoy dialogue-heavy films with actors who can portray the character in a way that makes me believe in them. The recent run of comic-based movies is thoroughly enjoyable to me, due to the rich storytelling and deep backstories from the comic books that the movies accompany. Seeing those characters given life by actors that pull off the mannerisms and attitudes helps ensnare new fans into the world of comics. Science fiction films draw me in because I have always been intrigued by the idea that our technological advancement will eventually cause issues that could lead to humanity’s downfall. When I can watch movies over and over again and find new, interesting subplots or Easter eggs, it makes the experience more rewarding. I do not enjoy films with plotlines that do not make sense, create a story too difficult for the medium to translate properly for the audience, or when movies start plotlines but do not see them through. When watching horror films, slasher films do not pique my interest as much as psychological or religious horror films do. I try to stay away from the general run of the mill action films that come out every summer, that tend to have the same formula as a lot of other action movies. In rare instances, the soundtrack of a film will turn me away if it does not fit the mood and movement of the film. This makes them very predictable and unenjoyable to me. I also find it difficult to watch movies that are based on books but take too many liberties and do not follow the book’s storyline. All in all, I enjoy watching movies and do so several times a week if I have the time. Whether it be new films or favorites that I have watched many times, it is always good to escape from reality for a short time and to relax. Movies have always been a good conversation piece for my circle of friends, and are usually what we choose to do when we get together. I find that I have no problem sitting down and starting any movie at home to see if it will capture my interest, but when it comes to paying for a ticket, I am more picky because I do not want to feel as though I wasted my money.