relationship between two organisms where one organism benefits but the other is neutral‚ there is no harm or benefit. An example of commensalism is a flatworm attaching to the horsecrab and eating the crab’s food while the crab is not affected. Commensalism *Parasitism is a type of symbiotic relationship between organisms of different species
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Short Essay 2: Genetically Modified Organism Debate A genetically modified organism is used to refer an organism whose genetic material has been changed by genetic engineering techniques‚ which cut and combine DNA molecules from different organism into one molecule (Wikipedia‚ 2012). This way‚ scientists can give it new characteristics that people desire but do not have normally. Since the benefits brought by genetically modified organism are extremely obviously‚ such as lower
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Made to order‚ E style 1. What was Dell’s original strategy? Dell’s strategy is to sell directly to customer and build computer thru customer’s own specifications‚ which they made a dominant share on the market on made-to-order PC’s. This strategy also encompasses customer service which they entailed an ordering system through phone. These steps made by Dell are to make the customer comfortable. 2. Why is Dell losing the competitive edge of its original strategy? As technology arises‚ a
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Weismann‚ who noted that two cell divisions were necessary to transform one diploid cell into four haploid cells if the number of chromosomes had to be maintained. In 1911 the American geneticist Thomas Hunt Morgan observed crossover in Drosophila melanogaster meiosis and provided the first genetic evidence that genes are transmitted on chromosomes. The term meiosis was introduced to biology by J.B. Farmer and J.E.S. Moore in 1905 Meiosis i/maɪˈoʊsɨs/ is a special type of cell division necessary for
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Cell Size Control David A Guertin‚ Whitehead Institute for Biomedical Research‚ Cambridge‚ Massachusetts‚ USA David M Sabatini‚ Whitehead Institute for Biomedical Research‚ Cambridge‚ Massachusetts‚ USA Growth in biological systems is defined as the accumulation of mass‚ which leads to an increase in size. In this article‚ we discuss how cells‚ organs‚ and organisms normally control growth‚ and how deregulated growth can lead to a variety of pathological conditions. Introductory article Article
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“If you aren’t concerned about the DNA from blueberries “transferring” into you‚ then you should not be concerned about DNA from GMOs either‚”says Layla Katiraee in her article “10 Studies Proving GMOs Are Harmful”(Katiraee). More and more Americans are becoming worried about the use of Genetically Modified Organisms in their food. The controversy of the use of GMOs in food can be understood through examining how they work‚ their disadvantages‚ and their advantages. Farming has transformed so
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Cell Specialisation All cells are designed to perform a particular job within an organism‚ that is‚ to sustain life. Cells can become specialized to perform a particular function within an organism‚ usually as part of a larger tissue consisting of many of the same cells working together for example muscle cells. The cells combine together for a common purpose. All organisms will contain specialised cells. There are hundreds of types of specialised cells. Below is listed some of the major ones
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GloFish: More than just glowing. What is a GloFish? GloFish is a genetically modified animal‚ a fluorescent zebra fish. It is made and then advertised by Yorktown technologies. It is a genetically modified organism (or GMO). The fish got the fluorescence from a red fluorescent protein from a sea anemone under the myosin light peptide 2 genes of zebra fish. The new green colored fish got is color from the extracted Green Fluorescent Protein that is taken from one jellyfish species called Aequorea
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Stem Cells and Tissue Renewal 1 The Multicellular “Habitat” • Cells of multicellular organisms – highly specialized – over 200 types in human body • Arranged into tissues‚ organs‚ organ systems • Unable to survive outside body “habitat” skin wont survive in heart tissues. They all start up identicals 2 Specialized Cell Types • Cells of early embryo identical • Differentiation results in specialized cell types – some differentiated cells continue to divide – many others are
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The Biological Importance of Water In Living Organisms Water is the most important molecule in cells‚ the whole organisms and on earth‚ this is due to it’s unique physical and chemical properties. ” A water molecule‚ because of its shape‚ is a polar molecule. That is‚ it has one side that is positively charged and one side that is negatively charged”(1). A water molecule is made up of two hydrogen atoms and one oxygen atom and the bonds between these atoms are single covalent bonds. Fig 1. The
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