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Biology Essay

WA 7
Zero population growth rate is virtually impossible because, to achieve it the birth and death rates have to be exactly the same. However the growth rate can be close to zero over a long period of time. The age structure diagram is affected by the birth and death rates of a population. Also the relative proportion of males and females in the population shapes it. The mortality rates at different cohorts affect the abundance of population in that cohort. Is the clapper rail headed for
Pages: 7 (1750 words), Essay
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Wooly nightshade
Addition, it produces a strong kerosene smell whenever the leaves are crushed and has the ability to flower throughout the year, producing berries during late spring and summer – they are first green and then turn to yellow when ripe (Ramel, 2012). Because of its fast growth, the woolly nightshade usually tends to grow taller than most plants in its surroundings (up to 30 metres tall) to become the dominant plant, so it can cover a very vast region within a relatively short period. This pest
Pages: 4 (1000 words), Essay
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Write a essay about those questions
The bacterium Nesseria gonorrhoeae infects the potential victim through the genital tract, mouth and rectum. Transmission of this bacterial disease is through sexual intercourse with an infected partner oral, anal or vaginal. The bacterium has its reservoir in infected humans. Symptoms of this STD include discharge in both men and women though some infected individuals may not present with any symptoms. These symptoms are evident after 2-10 days after sexual intercourse with an infected
Pages: 6 (1500 words), Essay
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What are the alternatives for a malaria vaccine after the RTS,S disappointments
Its infection manifest in human beings as a result of infection by Plasmodium falciparum, Plasmodium vivax, Plasmodium ovale or Plasmodium malariae with Plasmodium falciparum that is responsible for mass clinical cases and mortalities. In essence, the female anopheles mosquito transmits the plasmodium parasite. According to Coleman and Tsongalis 2009, it leaves the parasite in the human blood in the process of feeding on the blood meal. However, “Anopheles gambiae, Anopheles arabiensis and
Pages: 8 (2000 words), Essay
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Why is hepatitis E of increasing importance for developing as well as developed countries
Hepatitis E can also be as a result of placing a utensil or any other infected object into one’s mouth. It is as a result of the above mentioned reason that Hepatitis E virus is spread with ease in those areas where sanitary conditions are considerably poor or where humans hardly observe good personal hygiene. A great percentage of the infections are as a result of contamination of water supplies- and more especially after monsoon floods. It is also likely that animals can spread HEV since a
Pages: 6 (1500 words), Essay
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Why is hepatitis E of increasing importance for developing as well as developed countries
Hepatitis E can also be as a result of placing a utensil or any other infected object into one’s mouth. It is as a result of the above mentioned reason that Hepatitis E virus is spread with ease in those areas where sanitary conditions are considerably poor or where humans hardly observe good personal hygiene. A great percentage of the infections are as a result of contamination of water supplies- and more especially after monsoon floods. It is also likely that animals can spread HEV since a
Pages: 6 (1500 words), Essay
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Writing Assignment
Dietary deficiency of folic acid also plays a pivotal role in birth defects. The time of exposure to any of these agents play a crucial role in causing a birth-defect. Organ systems are the most affected parts due to the exposure to any of harmful agent. The central nervous system is more at risk because it starts developing during the third week of pregnancy – a time when woman is not even aware that she is pregnant. Women in the habit of consuming alcohol or drugs are most likely to harm
Pages: 8 (2000 words), Essay
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What are the strengths and weaknesses of an artificial kidney based on the use of proximal convoluted tubule cells
The mechanical removal of human waste is associated with a lot of challenges. Most fundamental is the fact that; the patient is not continuously involved in the removal of body wastes, but has to do it occasionally as programmed through the use of the dialysis machine. This puts the patients at a higher health risk, since the wastes may accumulate at a rate that was not anticipated by the physician, and thus cause the intoxication of the human body, while he/she still awaits the mechanical
Pages: 4 (1000 words), Essay
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Why is evolution true
The first chapter of the book dwells on this by drawing an example from a zoo to describe the nested hierarchy of living things (Shubin, 2009). The author uses the example of the common limb ancestry of all land animals characterized by five fingers, a wrist, one major bone and two lower bones. This strengthens the author’s argument that all living things are descendants of a common ancestor. Chapter one uses a hypothesis postulating that since land animals descended from a common ancestor
Pages: 10 (2500 words), Essay
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Why are allergies so prodominent in Georgia
And phosphorous, which are scarce have no cycling process, hence they are reused several times before being released from the system (Erik, 2009).Ecosystems are controlled by both external and internal factors. Internal factors that tend to control ecosystems are succession, disturbance and the types of species present. One of the external factors is climate as it defines the weather patterns of a location in the long-run. The parental material also which forms the topography and soil controls
Pages: 4 (1000 words), Essay
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Write an essay on industrial-scale production and purification of a heterologous protein
This paper will discuss all the aspects mentioned in depth, highlighting the factor that affect each of the steps involved in the production of heterologous proteins. After the successful production of the target protein, the last process involves rigorous purification of the protein.The initial step in the production of heterologous proteins involves understanding the properties of the protein of interest. This is critical as it determines the appropriate expression system that proves
Pages: 18 (4500 words), Essay
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What is the current status of clinical gene therapy trials for Chronic Granulomatous Disorder
By Assari (2006: 6) on mice found that gene therapy, using recombinant retroviral vectors, is an effective treatment for the reconstruction of normal neutrophils and in building ‘resistance to pathogens’ such as Aspergillus. The author also contends that gene therapy, using retroviral vectors in two humans, has produced ‘encouraging results’ where both of them have attained remarkable levels of gene corrected cells and their clinical conditions show good improvement (Assari 2006: 6).
Pages: 6 (1500 words), Essay
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Why Evolution should be taught in schools
Drawing a connection with the availability of fossil evidence, one debater states that evolution is a scientific fact. This is because of the numerous quantity of factual evidence that is available to support evolution. From genetics to bio – geography, genetics and palaeontology, the amount of evidence is vast. Paleontology deals with fossil evidence. Genetics deals with genes. Hence, by studying these entities, students are able to comprehend more on what they themselves are about (Debate,
Pages: 9 (2250 words), Essay
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What factors affect the rate of transport of molecules across cell membrane
As seen in Fig 2, the cell membrane is made up of thin layers of phospholipids. The molecules that can dissolve in them will be able to pass quickly. A good example is the fast absorption of ethanol by the stomach and intestinal walls (Kent 1998, p38).When the cell membrane contains more unsaturated fatty acids, it makes it fluid like. This increases the rate of active transport.The third factor is the electrical charge of ions and molecules (Kent 1998, p. The cell membrane through which the
Pages: 4 (1000 words), Essay
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Write an account of the uses of karyotyping
For many years pregnant women aged 35 and above have regularly been tested for chromosomal deviation which is a threat to their fetus. The possibilities of Down syndrome are also reduced like this. Younger women are tested less often because the risk of birth failings and disorder is low. Procedures like amniocentesis are also a risk for their lives .Pregnant women, however, can find out whether the child they are bearing is healthy or is yet another victim of genetic disorder. To avoid further
Pages: 4 (1000 words), Essay
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Within almost all eukaryotic cells the endoplasmic reticulum, Golgi complex and endosomes can be considered as a system, cooperating to deliver secerted material to the cell surface
In addition, they put away waste items.A vesicle is a little, membrane-encased sac that acts as a storage and transportation agent for substances. The plasma membrane, likewise alluded to as the cell layer, is a defensive hindrance that controls what goes into and goes out of the cell. There is additionally an organelle known as the spitzenkorper that is just present in parasites and is associated with the development of the hyphae tip (Cooper, 2000). In prokaryotes, endomembrane is uncommon,
Pages: 10 (2500 words), Essay
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What are the attributes and limitations of commonly used model organisms when applied to the study of human biology
They have a bigger and more mind boggling genome (Anton 2011). There is so much that humans can gain from prokaryotes especially E. This is because human cells have major differences in terms of the structure and functions of the cell.Since Escherichia coli is a bacteria, researchers must consider the health and safety of people. Some species of these bacteria can be harmful to the human body( Anton 2011). Good scientists should store the bacteria in a conducive environment for them to
Pages: 6 (1500 words), Essay
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Writing Assignment # 1
The animals were left to access water and standard laboratory food three days prior to the experiment. The composition of the foods that the mice accessed in the laboratory was proteins, non-nitrogenous foods, crude ash, crude fiber, energy, and sufficient minerals and vitamins to ensure that the health of the mice was maintained (Yamauchi, 2010).To test the hypothesis two experiments were performed. In the first experiment, mice were separated into two categories. The first group that was a
Pages: 4 (1000 words), Essay
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Writing Assignment # 2
Finally in foods, the concept of genetic engineering helps in the production of microorganisms that facilitates brewing, cheese making and baking.For the creation of genetically modified organism, three main components should be available. These are the gene that should be transferred, the organism to put it into or the target species, and the vector to carry the gene into the target species cells.The steps for making the genetically modified organism are generally precise but can be
Pages: 4 (1000 words), Essay
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Why do women live longer than men Does the answer lie in biology, nutrition, psychology or sociology
The health of the heart is crucial for maintaining health since it is the heart that sustains life and its ability to pump blood throughout the body that helps to sustain life. Research has shown that women, especially in the second half of their menstrual cycle and during their pregnancy show an increased cardiac output by almost 20%. The challenges that females face during pregnancy is compared to good exercise which helps in strengthening the heart naturally without addition effort from the
Pages: 8 (2000 words), Essay
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