The AMES test also known as bacteria reversed mutation assay is used to evaluate the mutagenic properties of test articles. The test was first developed by Bruce Ames in 1974 (Krebsfaenger). The amino acid dependent strain of S. typhimurium and E. coli are used in this experiment where in the absence of the external histidine source‚ the cells cannot grow to form colonies. Specifically these strains of Salmonella are defective in 1.) Repair of mutations (uvrB) and 2.) A rfa mutation (eliminating
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What kind of role does hydrogen peroxide and a liver have in their chemical reaction? In the experiment‚ we saw they had a reaction‚ but completed further tests to determine whether they changed after the reaction. Hydrogen peroxide is chemically changed into water and the liver is broken down in the reaction. In the experiment‚ a fresh piece of chicken liver was put into a test tube filled with 3% hydrogen peroxide. We knew a reaction was taking place because the hydrogen peroxide started to foam
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Title: Flame Test Aim: To determine the cation in each of the unknown substance X‚ Y and Z by observing the flame colour of different metal compounds. Introduction: A distinctive feature of many s-block metals is their ability to produce flame colours. At temperature of a Bunsen flame‚ a compound will decompose to give gaseous atoms of its constituent elements. When an electron in the gaseous atom absorbs energy from the flame‚ it will move from an orbital with lower energy to
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to higher quality. ANS: T PTS: 1 DIF: Difficulty: Easy NAT: BUSPROG: Analytic TOP: A-head: Defining Quality KEY: Bloom’s: Knowledge 4. The user perspective of quality judges a product based on how well the product performs its intended function. ANS: T PTS: 1 DIF: Difficulty: Easy NAT: BUSPROG: Analytic TOP: A-head: Defining Quality KEY: Bloom’s: Knowledge 5. According to the manufacturing perspective of quality‚ quality is based on the relationship of product benefits to price
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Chapter 5 1. What is the theoretical background of international R&D management? Research has suggested that large MNCs undertake between 5 percent and 25 percent of their R&D outside their home country. International R&D units may have originally been established to undertake adaptation work or because of host country demands‚ but increasingly the evidence suggests that they are becoming active contributors to the MNC’s global innovation effort‚ and even members of the core development
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CHAPTER 1 1. Which of the following would NOT lead to an improvement in the hiring system of an organization? |a. |communicate to the hiring managers about their annoying interview habits | |b. |use scientific methods and efficient selection methods | |c. |determine the motivations of job seekers |
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1. For an 18-inch pipeline designed for 150‚000 barrels per day‚ what is the short-run cost per barrel (per thousand miles) of transporting crude oil if the throughput is (a) 50‚000 barrels per day (b) 100‚000 barrels per day (c) 150‚000 barrels per day? Using chart 7‚ a) Cost of transporting 50‚000 barrels would be 30 cents. b) Cost of transporting 100‚000 barrels would be 17 cents. c) Cost of transporting 150‚000 barrels would 16 cents. 2. Can a 16-inch pipeline with 10‚000 horsepower transport
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Personality Tests in the Workplace Mark Twain once described a man who died and met Saint Peter at the pearly gates. Knowing that Saint Peter was very wise‚ the man asked the question that he had wondered about throughout his life. He said‚ “Saint Peter‚ I have been interested in military history for many years. Who was the greatest general of all time?” Saint Peter quickly responded‚ “Oh that’s a simple question. It’s the man right over there.” “You must be mistaken”‚ responded the man
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Assessing the ability of blind and partially sighted people: are psychometric tests fair? 1. Introduction Psychometric or standardised tests are assessments that measure knowledge‚ abilities‚ attitudes and personality traits. They are used in education and recruitment and can consist of written‚ online or oral tests. Blind and partially sighted individuals are potentially disadvantaged by the use of these tests. RNIB is often approached by teachers and parents concerned about the use
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Test Anxiety is defined by Kondo (1996) as a double situation specific personality trait‚ consisting of two psychological components; emotional arousal and worry. Several studies have focused on test anxiety‚ as it is associated with lower test results and a higher amount of stress‚ so has attracted attention from researchers and teachers (Hembree 1998; Sarason and Sarason 1990) as cited in Kondo (1996). Most of the focus has been to reduce test anxiety by investigating the cognitive‚ affective
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