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recombinant DNA

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Introduction

AS biology course work on recombinant DNA Brief description of RDNA Recombinant DNA is the general name for taking a piece of one DNA, and and combining it with another strand of DNA. Thus, the name recombinant Recombinant DNA is also sometimes referred to as "chimera." By combining two or more different strands of DNA, scientists are able to create a new strand of DNA. The most common recombinant process involves combining the DNA of two different organisms. The Recombinant DNA technique was engineered by Stanley Norman Cohen and Herbert Boyer in 1973. They published their findings in a 1974 paper entitled "Construction of Biologically Functional Bacterial Plasmids in vitro", which described a technique to isolate and amplify genes or DNA segments and insert them into another cell with precision, creating a transgenic bacterium. Recombinant DNA technology was made possible by the discovery of restriction endonucleases by Werner Arber, Daniel Nathans, and Hamilton Smith, for which they received the 1978 Nobel Prize in Medicine. (reference:http://en.wikipedia.org/wiki/Recombinant_DNA , info taken on 25 january 2008. ...read more.

Middle

DNA fingerprinting identifies similarities in DNA and can indicate evolutionary relationships, paternal or maternal identity, or someone's presence at a crime scene. Gene theraphy- is when a human gene is used to replace a missing defective gene in the humab. Cells can be altered by insertion of genes inside the body or by genes outside the body. Treatments have been developed using gene therapy for diseases like severe combined immunodeficiency and Cystic Fibrosis. How does recombinant dna affect the environment? Better crops mean that people have a large supply of food to sell and it keeps the economy functioning successfully also the large supply of food can be used to aid world hunger in poorer parts of the world as they are now drought and heat resistant. People are being protected from genetic diseases such as cystic fibrosis. Insulin can now be produced at a faster rate and much more cheaply, diabetic patients can now be treated much more affectively. Genetic technology has now advanced to help people with diseases such as cystic fibrosis ways new scientist shows how the different people feel and what its actually about. ...read more.

Conclusion

in New Fairfield, Connecticut Others argue that germ-line therapy would have a variety of harmful biological and social consequences, such as reducing the size of the human gene pool, or encouraging a 'black market' in therapy that would make children taller or brighter. And, in a society where germ-line therapy was carried out, 'people who are less than perfect would be steadily more disadvantaged, and this would tend to push people further into the realm of the unacceptable', says John Habgood, the Archbishop of York. (reference to- issue 1925 of New Scientist magazine, 14 May 1994, page 14. Information accessed at 25/01/08) Scientist now can create living bacterium: "Scientists have made a major step forward in creating life in the laboratory as researchers announce they have rebuilt a living bacterium from four bottles of chemicals. The scientists took the natural bacterium and painstakingly replaced its genetic structure, or genome, with DNA stitched together from chemicals. Eventually they had recreated all the genes that had been in the natural bacterium, effectively turning it into an identical but artificial organism."(Reference: http://www.dailymail.co.uk/pages/dmsearch/overture.html?in_page_id=711&in_start_number=0&in_query=recombinant+dna&in_restriction=&in_pub=0&in_order_by=date, scroll down on page and click news 3 with the head line- Scientists create artificial life in the laboratory - from four bottles of chemicals ). ...read more.

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Response to the question

Response to the question is basic. The introduction is good, but poorly explains what re-combinant DNA is, and the process by which it comes about, the real science behind the technique is not explained, therefore it makes it hard for ...

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Response to the question

Response to the question is basic. The introduction is good, but poorly explains what re-combinant DNA is, and the process by which it comes about, the real science behind the technique is not explained, therefore it makes it hard for the candidate to explain the uses of this type of DNA. Main body of the text examines a few uses, but problems with spelling due to rushing and only basic examinations of the different uses means that the level of this essay remains basic in terminology. Clear enough response to the question that is organised okay, but no conclusion.

Level of analysis

Although the student tries to use their own knowledge and an internet source, recombinant DNA is not explained very well. Also, the scientific terms they are are not very advanced. Do not explain the process of recombinant DNA into plasmids, which would be a much better way of leading to a definition of recombinant DNA. No conclusion, although the student does examine a range of different uses for re-combinant DNA and how it will affect the world. Could have been a lot more in depth and explain the process a lot better to reach a valid conclusion on the uses of recombinant DNA. Does not reference very well and should not copy and paste information from sources but put the source into their own words.

Quality of writing

Forgets to use capitals at the start of a sentence in some places. Problems with spelling in a few places, probably due to fast typing and then carelessness to check over the work again before submission. Grammar and punctuation remain largely okay apart from the missing capital letters.


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Reviewed by skatealexia 19/03/2012

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