The Klan s Organized Terrorism - 1114 Words

The Ku Klux Klan had three eras, an era ends when the Ku Klux Klan movement dies out or they loss the need for it. Each era may have its own intentions or what their main goal is, but white supremacy is still their goal just trying to accomplish it in different ways, while also opposing thing that may go against their moral code, like gay marriage. The Ku Klux Klan is an origination focused on having white supremacy, it has existed for many years and has had three eras, it is most known for its act violent acts of terrorism. The first era Ku Klux Klan was formed in Tennessee on December 1865 at the end of the civil war. The Ku Klux Klan was formed as a movement for white supremacy. It was formed as a violent group that relied on fear tactics to stay in power. As Jonathan M. Bryant said in an article â€Å"The Klan s organized terrorism began most notably on March 31, 1868, when Republican organizer George Ashburn was murdered in Columbus, Georgia.† George W. Ashburn (1814 - March 30, 1868) was a Georgia politician assassinated by the Ku Klux Klan in Columbus, Georgia for his pro-African-American sentiments. He was the first murder victim of the Klan in Georgia. This the first of the Klan’s organized terrorism it was soon followed by more. For the violence Ku Klux Klan choose to invoke, as Southern Poverty Law Center said. â€Å"lynching’s, tar, and featherings, rapes, and other violent arracks on those challenging white supremacy became a hallmark of the Klan.† The Ku Klux Klan wasShow MoreRelatedThe Ku Klux Klan. Cody Weber : Honors American History Essay1164 Words   |  5 Pages The Ku Klux Klan Cody Weber Honors American History Period 8 The Ku Klux Klan took a stand against equal rights for African Americans in a negative and racial manner by assaulting and abusing them. By doing this, the KKK wanted to make them feel like a lesser race. The KKK was founded in 1865 by six college students in the small town of Pulaski, Tennessee. The fore fathers of the Klan were John Lester, James Crowe, John Kennedy, Calvin Jones, Richard Reed, and Frank McCordRead MoreMass Murder And Terrorism : Terrorism1212 Words   |  5 PagesMass murder and terrorism are two completely different crimes in which most people tend to confuse. To understand terrorism, we need to understand what is terrorism and why is it different from mass murder. Before you can respond to the answer you must ask some questions about the crime. When someone commits a crime they have a motive and a goal in why they are committing the crime so in order to understand the crime that is taking place we need to ask what triggered the person to want to commitRead MoreThe Ku Klux Klan And The Civil Rights Movement1411 Words   |  6 PagesFounded in 1866, the Ku Klux Klan (KKK) extended into almost every southern state by 1870 and became a vehicle for white southern re sistance to the Republican party’s reconstruction-era polices aimed at establishing political and economic equality for blacks. Its members waged an unseen war of intimidation and violence directed at white and black republican leaders. Through congress passed legislation designed to stop and contain Klan terrorism, the organization saw its primary goal fulfilled throughRead More The Effectiveness of Terrorism Essay613 Words   |  3 PagesThe Effectiveness of Terrorism The dictionary defines terrorism as â€Å"The unlawful use or threatened use of force or violence by a person or an organized group against people or property with the intention of intimidating or coercing societies or governments, often for ideological or political reasons.† Is terrorism an effective political medium for the advancement of a political minority or rather an act of defiance rendering a society into a state of ephemeral hysteria? It remains toRead MoreThe Ku Klux Kl The Dawning Of American Terrorism1764 Words   |  8 Pages History of the Ku Klux Klan: The Begining of American Terrorism The Ku Klux Klan was founded in 1866 by a group of former Confederate veterans in Pulaski, Tennesse. The first two words in the groups name supposedly derived from the Greek word kyklos which translates to circle. There first leader (known in the Klan as grand wizard)Nathan Bedford Forrest was a former Confederate general. The group worked to establish what they called the Invisible Empire of the South Over the course of fourRead MoreThe Memoir Of A Recovering Skinhead895 Words   |  4 Pagescomprised of the Skinheads and the Ku Klux Klan (KKK). The definition of skinhead is a young man of a subculture characterized by close-cropped hair and heavy boots, often perceived as aggressive. During the mid 1960s in England, the first skinheads appeared. These European Skinheads had a dogmatic belief in the anti-Semitic Neo-Nazi Concepts regarding Jews, people of color and LGBTQ communities. Typically the Skinheads would operate under small-organized gangs or acting independently on their ownRead MoreThe Kkk And The Klux Klan1370 Words   |  6 PagesThere was a time when the Ku Klux Klan took over the Republican Party and dominated Colorado politics. In the 1920s, from Maine to California, in the cities and in rural communities, large numbers of men and women joined the KKK (Fleming). The KKK was and still are part of the Colorado history, for one could still find the Klan in Colorado, for the KKK ran the state Colorado from1924 to 1932 until it was disempowered by Franklin Delano Roosevelt.. After the election of 1924, the governor ClarenceRead MoreKu Klux Klan, Arkansas1830 Words   |  8 PagesKu Klux Klan - Harrison, Arkansas Over the years racism has been a problem with the United States, but more specifically, a group, referred to as the Ku Klux Klan. This group was formed by people across the United States, whom viewed themselves as the superior class of citizens. I am researching the Ku Klux Klan in Harrison, Aransas . I will discuss what the group is, how they made their second phase in Harrison, Arkansas, the Reconstruction, and their involvement in Harrison, Arkansas today.Read MoreFederal Bureau Of Investigation ( Fbi ) Defines Terrorism1693 Words   |  7 PagesIntroduction The federal bureau of investigation (FBI) defines terrorism as the unlawful use of force and violence against persons or property to intimidate or coerce a government, the civilian population, and/or any segment thereof. If one makes the argument that BLM is a terrorist group the ideology of the movement must fit within the framework stated above. First, BLM stands for â€Å"Black Lives Matter†. It, in itself is nothing more than a concept about which all else revolves. It is true, theRead MoreInterpreting The Clansm A Historical Romance Of The Ku Klux Klan And The Kloran1563 Words   |  7 PagesA Historical Romance of the Ku Klux Klan and the â€Å"Kloran† Thomas Dixon Jr. wrote The Clansman: A Historical Romance of the Ku Klux Klan (or simply The Clansman) which was based largely on his background in religion. He was a Southern Baptist minister. The Southern Baptist Convention (SBC) is a Christian denomination based in the United States. It is the world s largest Baptist denomination and the largest Protestant body in the United States. The Ku Klux Klan is fundamentally a white supremacist

Study On Discounted Cash Flow Techniques Finance Essay - Free Essay Example

Sample details Pages: 6 Words: 1817 Downloads: 4 Date added: 2017/06/26 Category Finance Essay Type Argumentative essay Did you like this example? In current practice, managers use DCF (discounted cash flow) and Traditional method analysis to estimate the investment in financial terms. In DCF method considers the time value of money in which reduces the time value of money progressively and it consist with NPV (Net Present Value) approach and IRR (Internal Rate of Return method). This could lead to more popularize investment appraisal techniques among the managers. Don’t waste time! Our writers will create an original "Study On Discounted Cash Flow Techniques Finance Essay" essay for you Create order A valuation method used to evaluate the attractiveness of an investment opportunity. DCF analysis uses future free cash flow projections and discounts them (most often using the weighted average cost of capital) to arrive at a present value, which is used to evaluate the potential for investment. If the value arrived at through DCF analysis is higher than the current cost of the investment, the opportunity may be a good one. Net Present Value The NPV which based on a required rate of return to each years projected cash flow, both in and out, is the application of discount factors. If the NPV is negative, the project should be rejected and if positive, the required rate of return is likely to be earned and the project should be accepted. NPV is especially appropriate for long-term projects, ranking investments by NPV does not compare absolute levels of investment. For Strengths of NPV by considering the time value of money, it also takes factors, like interest rates, cost of capital and investment opportunity costs into account. NPV not looks at profits and losses the way accounting systems do, it looks at cash flows. It can be tricky to determine and highly sensitive to the discount percentage. The technique works by discounting a projects cash flows by the Cost of Capital set by the organization. Each cash inflow and/or outflow is discounted back to its PV. Then they are summed. Each cash inflow and/or outfl ow is discounted back to its present value (PV). NPV = PV-costs (period, cash flow) pairs (n, Cn) where n is a positive integer, the total number of periods N, and the net present value NPV, the internal rate of return is given by r The NPV rule states that a project should be undertaken should its NPV be positive (Ross et al, 2005). The NPV rule includes the cost of capital or the discount rate to helping to take risk into account and covering any uncertain cash flows that may arise. It only includes the relevant costs, and it only takes these costs when they occur. The NPV rule uses cash flows instead of earnings, it uses all the cash flows of a project, and it discounts the cash flows with regards to the time value of money. Other forms of investment appraisal tend to ignore at least one, if not more, of these points. The NPV rule also provides a clear rule over the acceptance or rejection of a project. However, only future costs are taken into the analysis. This means t hat past costs are ignored because they do not vary with future decisions. There is also a heavy reliance on the discount rate, often difficult to calculate, and as a result, the cash flows can be complicated to predict. Cash flows are usually assumed to take place at the end of each year, but in practice, this is an over-simplification of the issue (Irons, 2004). Internal Rate or Return (IRR) The definition of IRR is based on NPV. In general terms, IRR is the value for r when the NPV equal to zero. This can be formulated as below   Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€š It is the method favored by many accountants and finance people, possibly the ones at your company. It provides a simple hurdle rate for investment decision-making. It is not as easy to understand as some measures and not as easy to compute. Computational anomalies can produce misleading results, particularly with regard to reinvestments. Having calculated the IRR the company can then accept any projects with an interest rate lower than the IRR and reject any projects with an interest rate higher than the IRR. NPV is highly sensitive to the discount rate, while IRR bypasses the problem of deciding the correct one. IRR is very good for screening projects. IRR is not an absolute amount, its a rate or ratio that more useful for comparing unlike investments, say stocks and bonds. It also more useful for making international comparisons, and comparisons between different periods and different sized firms. The intention here is not to argue for either point of view, but instead to put the issue into balance. Conclusion The aim of Investment appraisal is to help companies make decisions on which project they should invest in. Investment decisions involves making an outlay of something of economic value, usually cash, which the outlay precedes to benefits, so it is vitally important to a business. If a wrong decision is made, the effects on the business could be significant and it might also mean closing down the activity and sell the premises at a significant loss. According to above discussions, discount cash flow techniques have their own advantages and disadvantages. They normally based on some assumptions and reliable forecasting of key values. So its really important and necessary to choose the right and suitable method. Q2. Appraisal Methods for AP Ltd a) AP Ltd. is trying to evaluate 4 new projects. Assume all the 4 projects have a useful life of 10 years. For every business to know where they should invest their money it is essential to research what they should do. There are few main methods of appraisal that should be looked at: 1)  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   Annual Net Cash flow 2)  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   Initial Investment 3)  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   Cost of Capital 4)  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   Internal Rate of Return (IRR) 5) Net Present Value (NPV) Calculations I am going to use following form to calculate all those answers. ACF(Annual Cash flow)ÃÆ'Æ’-Present value Interest Factor of Annuity (PVIFA)-I.I(Initial Investment)=NPV PVIFA = 1-(1+r)ÃÆ' ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒâ€šÃ‚ ¾ÃƒÆ' ¢Ãƒâ€šÃ‚ Ãƒâ€šÃ‚ ¿ or table of PVIFA r Where r = interest rate n = number of periods A) IRR is the value for r when the NPV equal to zero. PVIFA = 0+I.I = 449.400 = 4.494 ACF 100.000 In the PVIFA table, 4.494 in the 10years row equal 18%, which is the IRR for the investment project. So the answer of A is 18% B) The Annual Cash flow in project 1 is  £100,000, Initial Investment is  £449.400 and the Cost of Capital is 14% which equal to 5.216 in the PVIFA table , to calculate the NPV of project we can use the formula as below. NPV = ACFÃÆ'Æ’-PVIFA-I.I =100,000ÃÆ'Æ’-5.216-449.400 =72,200 So the answer of B is  £72.200 C) In project 2, the IRR is 20% of 10 years life time. Then we can found the PVIFA of project 2 is 4.192 from the PVIFA table. And according to the definition of the IRR, we can use the kind of expression as below Cost of Capital = ACFÃÆ'Æ’-IRR20%,10years =70,000ÃÆ'Æ’-4.192 =293,400 So the answer of C is  £293,400 D) We already known the PVIFA14%, 10years is 5.216 and Initial Investment is  £293,400. So the NPV can be formulated as NPV = ACFÃÆ'Æ’-PVIFA-II =70,000ÃÆ'Æ’-5.216-293,400 =71,720 So the answer of D is  £71,720 E) The IRR of project 3 is 14%, and we know PVIFA14%, 10year is 5.216 . In this situation, we can follow the equation as below Net cash flow = Initial investment = 200,000 ÃÆ' ¢Ãƒ ¢Ã¢â€š ¬Ã‚ °Ãƒâ€¹Ã¢â‚¬    £38,344 PVIFA14%, 10yr 5.216 So the answer of E is  £38,344 F) Now we know ACF of project is  £38,344, so we can calculate F as follows F= NPV+II = 35,624+200,000 = 6.145 ACF 38,344 Then looking for the PVIFA 6.145 in the 10 years row of PVIFA table, we can find tha t this value equal to 10% which is the Cost of Capital for project 3. So the answer of F is 10% G)According to the table PVIFA12%, 10year is 5.650, and Initial Investment is  £300,000 in project 4. Net cash flow = NPV +I.I = 39,000+300,000 = 60.000 PVIFA14%, 10yers 5.650 So the answer of G is  £60.000 H ) PIVFA= 0+I.I = 300,000 = 5 ACF 60,000 According the PVIFA table, the PVIFA 10years of 5.0 in is 15%, which means internal rate of return for the investment project 4. So the answer of H is 15% b) Both NPV and IRR methods valuable and favorable guides in business practice. Both the IRR and the NPV take account of time value of money, but situations arise where the IRR method leads to different decisions being made from those that would implement the NPV method. However, In some cases, a project with a higher NPV can produce a lower IRR. As in this part, the IRR and NPV method are not always agreed. First, compare the three project 2,3 and 4, we can easy to find that the project 2, which has greater IRR, also get greater NPV. The method of IRR and NPV are agreed. Obviously, for the AP Ltd, the project 2 is better than the project 3 and 4. Second, compare the project 1 with the project 2, the IRR and NPV method are offering conflicting recommendations. The project 2 has greater IRR than the project 1 whereas the project 1 has larger NPV than the project. why the NPV and IRR methods are getting conflicting recommendations and which one we should choose? Conflicting recommendations can be occurred, because projects have differences in size and/or cash flow timing. When one project is larger than another one, the bigger project can has a larger NPV but a smaller IRR, while the smaller project may get a larger IRR but smaller NPV (Emery et al, 2007). As in this case, the project 1 has larger NPV, but smaller IRR than the project 2. In generally, the project which get larger NPV is better. Therefore the method of NPV is superior to the method of IRR, when mutually exclusive projects differ in size. The problem of the difference in cash flow timing is caused by the reinvestment rate assumption (Emery et al, 2007). The method of IRR assumes that the future cash flow of the project can reinvest at the IRR, while use the method of NPV to imply that they are going to earn the cost of capital. And the best assumptions is the one which made my the method of NPV. Because if the project generate the business organization use the cash flow, the organi zation doesnt need borrow money from the other place. In other way, the cost of capital is the opportunity cost of the funds. Again, the method of NPV is superior and has better assumption. Conclusion When using NPV to guide an investment decision, a firm needs to estimate the future cash flow and the return required by its investors. According to finance theory the return required depends on the projects risk and required by the investors is often referred to as the firms cost of capital. Projects offer rates of return less than the cost of capital are not worthwhile undertaking financially, and the return Investment projects offer rates of return higher than the cost of capital add value to the firm. According to those above considerations and the results of the investment appraisal techniques, I would recommend the project 1 for AP Ltd. Because it has a larger NPV and from the financial view that it has the highest return on investment.

Biology By2 Revision Free Essays

Parasitic Nutrition 21 May 2011 10:43 = organisms that live on or in another organism obtaining nourishment at the expense of the host and causing harm. Gut parasite (Taenia solium) = tapeworm Primary host = human (eat uncooked infected pork) Secondary host = pig (drainage channels contaminated by human faeces) Adaptations†¦ – Suckers hookers (attachment) – Body covering (immune responses) – Thick cuticle (inhibitory substances = enzymes) – Simple body systems (reproduction) – Very thin large surface area (food absorbed over whole body surface = diffusion) – Male female sex organs (gut can only accommodate 1 tapeworm) – Number of eggs produced (increase chance of survival) – Eggs have resistant shells (survive until eaten) Dormant embryos can form cysts in organs – damage surrounding tissue BY2 revision Page 1 Adaptions to different diets 21 May 2011 10:53 Reptiles Amphibians = swallow food whole Mammals = cut up and chew (palate separates nasal cavity mouth – kept in mouth longer) Carnivore = short gut (easily digest protein) Herbivore = long gut (plant digestion difficult) Dentition Mechanical digestion = easier to swallow increases surface area for enzyme action Herbivore Incisors Canines Lower jaw, cuts against horny pad (upper jaw) Indistinguishable from incisors Carnivore Sharp (tear flesh from bone) Large, curved, pointed = seizing prey, killing tearing flesh Carnassial (slide past each other = garden shears) molars = cutting/crushing) Vertical (open wide to capture kill prey) Not horizontal (dislocation) Jaw muscles = well developed/powerful (grip firmly on prey/crush bones) Cheek teeth Interlock. (W into M) Worn down = sharp enamel ridges (efficiency). We will write a custom essay sample on Biology By2 Revision or any similar topic only for you Order Now Open roots (grinding) Jaw movement Other Circular grinding. Horizontal plane Diastema = gap between front side teeth. Tongue moves cut grass to grinding surfaces (cheek teeth) Ruminants Produce most protein eaten by humans eg. Cows/sheep Mutualism/Symbiosis = close association between members of 2 species, both derive some benefit from the relationship. – Can’t digest cellulose (no cellulose enzymes) – Cellulose-digesting bacteria live in gut of cow – Separated = food left long enough for digestion, bacteria isolated (optimum pH conditions) Cellulose digestion†¦ – Grass chopped (teeth), saliva, cud formed, swallowed – 1st stomach = cellulose digesting bacteria (glucose = fermented – organic acids into blood. Waste = co2 methane – Cud into next region, regurgitated chewed again – 3rd stomach = water absorption – 4th stomach (‘normal’ stomach) = protein digestion – Small intestine = absorption Rumen = greater variety of mutualistic organisms than in caecum More efficient = more complete breakdown of cellulose Bacteria = source of protein when dead BY2 revision Page 2 Digestion 21 May 2011 11:35 = the break down of large insoluble molecules into smaller soluble molecules. Physical chemical. Food passes through alimentary canal where it is digested absorbed into the body. Digestive enzymes = hydrolases (catalyse hydrolysis of substrate – addition of water) – Carbohydrates (polysaccharides) disaccharides monosaccharides (Amylase = maltose glucose) – Proteins polypeptides dipeptides amino-acids (peptidase = endo/exo) – Fats fatty acids glycerol (lipase) Mouth (buccal cavity) – Mechanical digestion (teeth) †“ Saliva = salivary lands (mucus, salivary amylase mineral ions = optimum pH – slightly alkaline) = lubrication some protein digestion (amylase = starch maltose) – Swallowed as bolus Oesophagus – Peristaltic contractions (longitudinal circular muscles = not under conscious control) – Occurs all way through alimentary canal Stomach = muscular sac (2 sphincter muscles = cardiac pyloric keep food in stomach) – Muscles in stomach wall contract rhythmically (mix food with gastric juice = secreted by stomach wall) – Gastric juice = optimum pH of enzymes (pH2. 0), kills most bacteria, peptidase enzymes = protein polypeptides Pepsinogen (inactive) = activated by HCl to active peptidase enzyme – Mucus = form lining (protect wall from enzymes acid/assist movement) – Food leaves as chyme – Purpose of HCl = optimum pH for enzymes, kill microbes, activate pepsinogen (pepsin) Gastric glands = peptic/chief cells (pepsinogen = inactive until HCl), oxyntic (secretes HCl) goblet cells (mucus) Small Intestine = duodenum (first 20cm) ileum Bile = produced in liver, stored in gall bladder, into duodenum via bile duct. = no enzymes. Bile salts = emulsifying lipids (lowers surface tension = globules – droplets [surface area]) = neutralise acidity = exocrine glands in Pancreas via Pancreatic duct. = Contains enzymes. Trypsinogen – Trypsin (Enterokinase) = Endopeptidases (protein peptides) Pancreatic Amylase (starch maltose) Pancreatic Lipase (lipids fatty acids glycerol) Pancreatic juice Walls of duodenum = Brunner’s Glands (secrete alkaline juice mucus) – correct pH lubrication/protection Enzymes secreted by cells at tips of villi (Crypts of Lieberkuhn) Maltase = Maltose 2 Glucose Sucrase = sucrose glucose galactose Endopeptidases/Exopeptidases = polypeptides amino acids Endo = quaternary/tertiary – smaller polypeptides. Exo = peptides – amino acids Absorption Ileum adapted†¦ – Long BY2 revision Page 3 – Long Lining folded = large surface area Villi = finger like projections Epithelial cells = surface of villi (microscopic projections – microvilli) Large number of mitochondria = lots of energy required Glucose Amino-acids = epithelium of villi (diffusion active transport) into capillary network – hepatic portal vein to liver Fatty acids Glycerol = lacteal (blindly ending lymph capillary) – lymphatic system into bloodstream (thoracic duct) Fatty acids, Glycerol most vitamins = diffusion through epithelial cell membrane Glucose, Amino acids dipeptides = need ATP (energy) – co-transport (Na+ ion) Dipeptides digested intracellularly-pump ions out and then draws more in – carries molecules in with it. Large intestine – Caecum, Appendix, Colon Rectum – Water mineral salts absorbed in colon – vitamins secreted by micro-organisms (vitamin K folic acid (Vitamin B9) – Faeces = semi-solid condition (undigested cellulose, bacteria, sloughed cells) – defaecation Uses†¦ Soluble food products – bloodstream – tissues (assimilation/provide energy) – Glucose = energy release (respiration)/excess stored (fat cells) – Amino Acids = protein-synthesis. Cannot be stored (deaminated – urea {disposed} carbs {stored}) – Lipids = membranes/hormones/excess stored as fat BY2 revision Page 4 Structure of the gut 24 May 2011 08:52 Peristalsis = aids movement of food through alimentary canal 1) 2) 3) 4) Ingestion Digestion (mechanical = increase surface area/chemical = enzymes, glands in wall/outside wall) Absorption Egestion Structure of Mammalian Gut – Outer serosa = layer of connective tissue (protection/reduces friction from other organs as it moves) – Muscle layer = inner circular/outer longitudinal muscles = peristalsis – Sub-mucosa = connective tissue, contains blood/lymph vessels – absorption nerves (co-ordinate muscular contractions – peristalsis) – Mucosa = innermost layer (lines wall of gut), secretes mucus (lubrication protection), secretes digestive juices in some regions (stomach)/absorbs food (ileum) – Lumen = cavity of gut BY2 revision Page 5 Glands 1) Large glands outside gut – secretions pass through tubes/ducts into lumen Eg. Salivary gland, liver, pancreas 2) Glands in form of cells in sub-mucosa Eg. Secrete mucus in duodenum (Brunner’s glands – alkaline juices also) 3) Glands in form of cells in mucosa Eg. Gastric glands(stomach) = gastric juice Crypts of lieberkuhn(in base of villus of small intestine) = enzymes (complete digestion) – maltase = maltose – Sucrase = sucrose – Endopeptidase/exopeptidase = peptides/dipeptides BY2 revision Page 6 Adaptions for nutrition 24 May 2011 09:37 Nutrition = obtain energy to maintain life functions and matter to create/maintain structure (from nutrients) Autotrophic plants Use simple organic materials CO2 H2O to manufacture energy make complex compounds (make own food) – provide food for others = producers Green plants build up complex organic molecules eg sugars from CO2 H2O. Source of energy = sunlight (absorbed in chlorophyll related pigments) [6CO2 +6H2O C6H12O6 + 6O2] Use energy from special methods of respiration to synthesize organic food Consume complex organic food material (cannot make own food) = consumers. Take food into bodies and break down by digestion. Usually internal in digestive system. Digested material – absorbed (body tissues – used by cells) Herbivores/Carnivores/Detritivores Dead/decaying matter – no specialized digestive system. Secrete enzymes outside body absorb. (extracellular digestion). Microscopic = decomposers (important recycling valuable nutrients – nitrogen) – Photosynthesis Plants/algae/ certain bacteria Autotrophic bacteria Animals, fungi, some protoctists bacteria Most animals – Chemosynthesis Heterotrophic – Holozoic feeders – Saprophytes (saprobionts) – Parasites – Mutualism (symbiosis) Fungi some bacteria Tapeworm Organism that live in/on another organism and receive nutrition from it. Host suffers harm. Highly specialized. Cellulose Involves close association between members of2 different species. digesting bacteria Both derive some benefit from the relationship BY2 revision Page 7 Reproductive Strategies 24 May 2011 10:08 Life cycle = sequence of changes through which it passes during its life from origin in reproduction until death. Reproduction = ability to produce other individuals of the same species Asexual – Rapidly produces large numbers (identical genetic composition = clone) – Binary fission (eg. Unicellular organisms – bacteria/amoeba) – Budding (eg. Hydra/yeast) – Bulbs (eg. Onion/daffodil) – Runners (eg. Strawberry) – Tubers (eg. Potato) Sexual – Involves 2 parents – Less rapid than asexual – Offspring are genetically different – Fusion of haploid gametes Advantages/Disadvantages†¦ Asexual = lack of variety (adapting to environmental change) = if well suited to environment conditions, large numbers of successful type built up quickly Sexual = genetic variety (adapt to environmental change) = development of resistant stage in life cycle (can withstand adverse conditions) = formation of spores, seeds, larvae = dispersal of offspring. Reduces intraspecific competition – enables genetic variety to develop as required. = more chance of mutation (complexity of process) Production of Gametes Diploid = body cells (mitosis) Haploid = sex cells/gametes (meiosis) Haploid Sperm + Haploid Egg = Diploid Fertilized Egg Zygote formed – mitosis to grow Male gamete = small extremely motile Female gamete = large/sedentary (presence of stored food) Mammalian eggs have only enough to survive until formation of placenta External Fertilization – Discharge gametes directly into sea/freshwater – Considerable wastage = eggs may not encounter sperm – Vast numbers of gametes produced – Frogs – joining of sperm/egg assisted by coupling. Male rubs hind legs on female for her to lay eggs, he immediately releases seminal fluid over them. – Amphibians usually terrestrial, must return to water to breed = external fertilization Internal Fertilization – Occurs inside body of female – Requires intermittent organ to introduce sperm to female’s body – Less chance of gametes being wasted BY2 revision Page 8 – Less chance of gametes being wasted Allows male gamete to be independent of water for movement Fertilized egg can be enclosed with protective covering before leaving female. (Animals lay eggs) Embryos develop within parent and derive nourishment from her (placenta) = greatest adaption (mammals) Development of Zygote – Usually outside body – easy prey for predators – Many eggs produced to ensure some survive – Insects, internal fertilization (ensure sperm deposited in female’s reproductive tract), external development (laid on food source) – Evolution of amniote egg (reptiles/birds) = fluid filled cavity, surrounded by membrane protective shell, encloses embryo within yolk sac – Birds incubate eggs = embryo development (external) – Mammals = young retained in mother’s womb/uterus (no shell). Embryo nourished from mother’s blood supply (placenta). Born in relatively advanced state of development. Parental Care – Very little usually – Stickleback looks after eggs, defends territory, fans eggs to provide o2 until they hatch – Birds mammals = provision of shelter, feeding, protection from predators, training for adult life. More parental care provided = fewer offspring produced Unisexual /Hermaphrodite – Plants = male and female gametes produced in one individual – Every individual capable of forming fertilized eggs – Possibility of self-fertilization = inbreeding (reduced genetic variability) – No intromittent organs – special techniques evolved for transferring gametes Success of Insects – Mainly terrestrial – Depend on these to pollinate crops – Competition for food also – Carry disease eg. Malaria Incomplete Metamorphosis (eg. Grasshopper) – Egg – Intermediate form = nymph (resembles adult – smaller) – Hard exoskeleton – doesn’t grow, must shed skin/molt – Does this a series of times until it reaches full size Complete metamorphosis (eg. Butterfly/housefly) – Egg – Lava (specialized for feeding/growing) – Pupa/chrysalis – complete change – Emerges as adult specialized for dispersal and reproduction Plants Simple plants = algae (seaweeds = confined to sea) mosses ferns (confined to damp areas -male gamete can swim to egg) Successful plants = conifers flowering plants (independent of water for reproduction – able to colonize land) Flowering plants = morphology (Efficient water carrying xylem vessels reproduction) – Male pollen grains with hard coat = withstand desiccation (transfer to stigma of female – affect by environmental conditions) – Plants grasses = small inconspicuous flowers – pollen carried by wind – Brightly coloured flowers scent = attraction by insects (carry pollen to stigma) BY2 revision Page 9 – Brightly coloured flowers scent = attraction by insects (carry pollen to stigma) Male gametes travel through pollen tube to female part and egg (no longer needs film of water to reach egg) Fertilised egg develops into seed containing food store (with resistant coat) Key to success = relationship with animals (attract insects which pollinate/seed dispersal) enclosure of eggs in ovary and evolution of seed – Can survive adverse conditions Flowering plants are so successful because of†¦ – Short interval between flower production and setting of seed (few weeks) – Seed with food store = embryo develops until leaves are produced above ground (photosynthesis) – Seed protects embryo from desiccation other hazards = resistant coat – Leaves deciduous succulent = decay when fall to ground – humus produced. (rapid recycling of ions for reuse) BY2 revision Page 10 Translocation 24 May 2011 14:41 = transport of soluble organic materials, sucrose a nd amino acids (bi-directional movement) Products of photosynthesis = phloem. From source (area that makes the photosynthate – sucrose = leaves) to sink (where needed for growth/storage) Phloem structure – Sieve tubes (adapted for longitudinal flow of material = no nucleus ,have pores =sieve plates allows rapid flow of manufactured food substances) – Companion cells (linked to sieve tubes by plasmodesmata with fibres parenchyma, dense cytoplasm = lots of mitochondria – lots of metabolic activity, large nucleus – controls activity) – Phloem fibres – Phloem parenchyma â€Å"Mass flow† hypothesis – There is a passive flow of sucrose from source to sink – Does not account for observations such as movement in opposite directions at same time rate – Other hypotheses = diffusion, cytoplasmic streaming Evidence for translocation†¦ 1) Aphid (greenfly) – Feed (proboscis), leave embedded proboscis, liquid = sucrose amino acids. Sectioning stem shows proboscis is in phloem sieve tu be 2) Ringing Experiments – Cut off ring of bark (including phloem, leave xylem), immerse in water. Swelling above cut = accumulation of organic solutes, cannot continue. Will eventually die 3) Radioactive isotopes – Carbon-14 supplied to plant – fixed in glucose upon photosynthesis (14C6H12O6) – Stem cut, x-ray = phloem contains radioactivity BY2 revision Page 11 How to cite Biology By2 Revision, Papers

Oligopolies in the United States Economy free essay sample

There are many models of market structure in the field of economics. They include perfect competition on one end, monopoly on the other end, and competitive monopoly and oligopoly somewhere in the middle. In this paper, we will focus on the oligopoly structure because it is one of the strongest influences in the United States market. Although oligopolies can also be global, we will focus strictly on the United States here. We will define oligopoly, give key characteristics important to the oligopoly structure, explain why oligopolies form, then give an example of an oligopoly in todays economy. Finally, we will discuss the benefits and costs in this type of market structure. Oligopoly is defined as a market structure in which there are a few major firms dominating the market for a specific product or service. One key factor in oligopolies is that each firm/company explicitly takes other firms likely responses into account when setting prices, launching new products, etc. We will write a custom essay sample on Oligopolies in the United States Economy or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page For this reason, there is significant friendly competition between firms. They each know that it is in their own best interests to maintain a stable price, for if they lower their prices, their competitors ill do the same and knock out any advantage the original firm was hoping to gain with lower prices. If they raise their prices, the competitors will not follow suit and will therefore steal away all the customers of the higher priced product. Another key factor in oligopolies is that there are significant barriers to entry into this market. These barriers can include things such as high fixed costs, availability of resources, and brand loyalty. Many smaller companies simply do not have the cash or resources to compete with these large firms. Another characteristic of oligopolies is hat the percentages of market shares change very little from year to year and are dependent upon introduction of new products or acquisitions of smaller companies. For this reason, a benchmark of oligopolies is that they offer many Varieties in an attempt to gain some edge over their competitors. Why and how to oligopolies form? Oligopolies generally form over time as larger companies acquire or buy out smaller ones. They do this in order to gain market presence, new technology, more efficient production methods, etc. Oligopolies are sustained through price competition, brand loyalty, and incessant advertising. A perfect example of an oligopoly market structure in the United States is seen in the carbonated beverages industry. There are a few major brands, namely Coca Cola, Pepsi Co and Dr Pepper Snapple Group, who control the vast majority of the market, a combined 89. 6%.