DNA Essay

A lot of interest on DNA knowledge emanates from the fact that parents are able to pass certain traits to young ones. DNA comprise of the genes, which are segments with hereditary information. This essay on DNA explains what constitute the DNA.

This essay on DNA shows functions of the DNA. By reading this essay on DNA, you will learn how DNA is constructed and form a picture of it in mind. This essay on DNA also shows how DNA would control working of cell and organism as a whole.

The DNA are constituted of the nucleotides and is the third, including RNA and protein, which are the macromolecules that form basis of life.

Millions of nucleotides (which are basically the repeating units) join together to make up the DNA. Two coiled helical chains form the backbone of the DNA, and support the bases (Thymine paired with Adenine and Guanine paired with Cytosine) located in between and along the two chains.

Phosphate and sugar molecules are what comprise the two-coiled helical chains constituting the backbone of the DNA, but they occur in an alternating manner. Through cell division, a DNA is capable of replicating.

Actually, the work of the DNA is to store the genetic information. It is concerned with storing information that helps in manufacturer of proteins and RNA molecules. First, this information is contained in genes, which are among the sequences of the DNA. There are other sequences involved in regulating this genetic information.

The purpose of the sequence of the bases located along the backbone chains is to encode the hereditary and genetic information. The strands formed by nucleotides (and which form the backbone) are anti-parallel and opposite to each other. The sequence is replicated to the sequence of amino acids within proteins. Remember, almost all functions in a cell are directed by proteins.
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The reading out or copying of the DNA sequence (sequence of the four bases) is termed as transcription. In this process, stretches of DNA are copied into related RNA. Remember, DNA replication occurring before cell division involves duplication of chromosomes. Chromosomes are basically the organized DNA structures in cells.

The interaction between DNA and other proteins also occur as guided by the compact structures that compact and organize DNA within chromosomes. An example of such a compact structure is the protein chromatin. They also play an important role of controlling which parts of DNA will undergo transcription. 

                                          
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Essay Sample On AIDS

Aids is a known killer spreading so quickly. Almost everyone around the world now knows what Aids is, at least the surface of it, if not the in depth. It is among the diseases mostly talked about across the world.

Although there are many essays on aids posted even on the internet, there is always the need to discuss about it and reach out to more people. A lot more people need constant information as a reminder if not to hear it for the first time, which necessitates writing more essays on aids. This essay on aids discusses facts about the diseases and causes. These essays on aids also discuss a short history about the disease.
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To begin with, the HIV virus is the causative of AIDS. In itself, Aids is a condition defining the inability of the body to fight diseases following an attack of the HIV. This is known as Human Immuno Deficiency Virus. Between infection with HIV and emergence of AIDs as the last stage, is a span of about 10 years, which represents a body that has failed to keep up with the fight against the virus. In itself, HIV can stay for several years in a body and showing no signs at all at the same time.

As far as history of HIV is concerned, the first person to be identified with the disease was in America-in 1959. Later, cases were identified in Africa in countries such as Uganda and Tanzania, way in 1980s. Another country where a case(s) was (were) noted is Zambia. There were also cases in India, France and Belgium at the same time.  

Apart from the commonly known spread route-sex, HIV can spread where there is blood-blood contact, for instance in blood transfusions, passing of it from mother to unborn child, and through infected syringes. Sexual relationships are the common spread route for HIV.   

                                                                

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Essay On Global Warming

Global warming is a name given to increase of global average temperature of the atmosphere and ocean. The term has gained so much popularity become since the 19^th century. Today, the rate of global average temperature is increasing as well and is projected to increase even further.

The importance of studying global warming and thus writing an essay about global warming cannot be gainsaid. For instance, the knowledge of how global warming occurs needs to be advanced. This is because, although many are aware of it, some are still ignorant.

In addition, studying essays about global warming can help people understand how global warming leads to climate changes. However, the most shocking thing is that, despite the large number of essays about global warming, many do not seem to have read. A lot of careless attitudes about emission of greenhouse gases seem to indicate that many do not know how it is produced. Many do not also seem to know how to control such emissions and the advantage of doing so.
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There are many things that seem to prove that there is an increase in greenhouse gas emission and increase in global average temperature. One is the rising sea level (average), rise in oceanic temperature (average) and melting of ice. One of the biggest challenges in as far as global warming is concerned is that people cannot see these impacts of increased global temperatures.

Other impacts, however, are visible but not directly related to global warming. In fact, it is hard to tell to locals the relationship between them and global warming. An example is expansion of deserts and occurrence of more floods. However, the increase in global temperature is not uniform in all parts of the globe. What is needed is continued education regarding global warming, its causes and solutions.

                                                                   
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Essay On DNA

DNA is the short form of Deoxyribonucleic Acid and is the hereditary material for almost all living things. Although you might have read it in many DNA essays, this DNA essay elaborates on the functions of DNA. In addition, you will find where DNA is located, by reading through this DNA essay. This DNA essay will also enlighten on what constitutes the DNA and how it works.
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DNA is mostly contained in the nucleus of each cell, for those living things with it. The mitochondria DNA also exist in mitochondria. The RNA viruses do not contain the DNA. The DNA contains the genes that carry the hereditary information.

DNA is constituted by two strands on nucleotides, made up of four building blocks each. The four building blocks are the chemical bases, namely the thymine (T) and cytosine (C). The other two are guanine (G) and adenine (A). Just the same way letters in an alphabetical order will order themselves differently to form different words, different organisms are built and maintained by different information depending on how the four building blocks are ordered and sequenced in code.

Remember, bases pair with compatible others to form pairs, C with G and A with T. In actual sense, a phosphate and sugar molecule plus the base are what constitute a nucleotide. The nucleotide is arranged as double helix spiral and ladder-like strands, with the ladder rungs constituted by the base pairs and the vertical piece of this ladder constituted by other two molecules, namely the phosphate and sugar molecules.     

DNA molecules subdivide during cell division, to make exact copies of themselves. During this process, duplicates of the sequence of bases are formed. Remember, each of the new cell formed is required to have a similar DNA to the parent one. A lot of DNA studies emphasize on hereditary knowledge because DNA serves this purpose. 

                                          
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Essay On Creation Vs. Evolution

Among the many ancient controversies is that surrounding creation vs evolution. In fact, this controversy transcends political, cultural and theological arena. The controversies also cut across a number of issues, including the human life, universe and earth.

The controversy is of great interest among those who want to write creation vs evolution essays. Creation theories establish that the source of life is Supreme Being, who by word of His mouth created two people who latter reproduced. This is the common theory among the religious people, and taught by faiths around the world.
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They also posit that God is the creator of universe. The contrast is between those holding this belief, with those holding that the evolution, biological theories, geology and other theories explain existence of human and the universe as a whole. The details in each of these theories are of great interest among those writing creation vs evolution essays.

The term creationism was also introduced for those supporting and defending the role of a Supreme Being for existence of universe and living things. On its part, evolution establishes that all modern living things originated from descendants and ancient forms and they are what they are today because of undergoing changes over time. It is proved by the idea of natural selection that shows that organisms are able to acquire genetic change over time. 

Those writing creation vs evolution essays will tackle a number of topics. Among the issues of interest for those writing creation vs evolution essays include definition of science, science research and separation of state and church.

Universally, evolution has gained acceptance as the source of human life and universe as a whole. In fact, battles between those supporting evolution and those supporting creation is viewed as battle between science and religion.

However, those writing creation vs evolution essays may also note that today, many religions accept the evolution explanation of existence of living things and universe as a whole.

                                         

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Biology Extended Essay

Biology is a subject and discipline that discusses issues of human life as well as that of other living organisms. A Biology extended essay will discuss any issue related to biology. 

Evolution

Evolution theories show how life undergoes progression, change and development. One important thing clear in evolution theories is that all life has common origin. By definition, it is the change realized in a gene pool. Remember, genes are those that are transferred from one parent species to another.

However, standing out in evolution theories is the term natural selection. It shows how biological traits might lessen or increase as differential reproduction through random mutations naturally occurs. This is unintentional and happens for improved survival of organisms and increased reproductive ability of organisms.

When writing a biology extended essay, students might site the common examples in biological evolution. For instance, a very common example cited as far as natural selection is concerned is the case of increase in number of dark colored English moth around Manchester and other industrializing cities during industrial revolution. It was noted that 95% of the moths were dark in color by 1898, yet prior to 1848, this type (dark colored moths) constituted only 2% of the moths.
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The evolution was attributed to the fact that this period, industrial revolution was taking place and because the white type was susceptible to eating by birds while on trees while dark type could not easily be seen by birds against a dark background (because industrialization came with increased factories and more soot covered birch tree). It means more dark moths survived and reproduced to increase. Yet there were only lesser of the dark type in rural areas. Such is an example of a change in gene pool: dark colored moths increased in frequency. 

Another term introduced in evolution theories is artificial selection, which depicts how organisms might intentionally choose to reproduce by combining particular traits.   

                                           
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Essay On Biology

Biology essay involves discussion of topics related to living organisms such as their characteristics, growth, origin and distribution, among others. Biology is categorized as a natural science and is studied in high school, basic education institutions as well as higher institutions of learning. A biology essay will also discuss about the anatomy of living things as well as things like evolution. 
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In some cases, students are expected to choose among science subjects and biology is one of them. Clearly, a lecturer, teacher or a professor might choose from a variety of topics when assigning biology essays. What a student must have in order to succeed in writing biology essays is the relevant knowledge to tackle the topic: otherwise, they must look for someone who has done biology course to write it for them.

Of course, you can get such topics as biological molecules, cell anatomy, cell physiology and chemical structure of cells. One could also be told to discuss organ systems and ecology, how environment affects organisms.

Cell theory establishes how a cell forms the basis of life, how it undergoes division and its pathological processes. Cells also undergo metabolism according to the cell theory. Cell theory also focuses on the DNA, which is the basic of passing information from one cell to another as the cell undergoes division. These are some of the things you might be asked to write about a biology essay.

Biology involves discussion of issues such as cells, genes, species and others. Of course, the term cell is a big concern in biology because it is termed as the basic unit of life. Biological studies recognize inheritance of genes as well as evolution of current species to form relatively new species. Biological studies discussing heredity revolves around genes. It also shows how organisms strive to survive amidst harsh environment, to continue reproducing and living.

                                   

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