The polymerase chain reaction (PCR) is a biochemical technology in molecular biology used to amplify a single copy or a few copies of a piece of DNA across several orders of magnitude‚ generating thousands to millions of copies of a particular DNA sequence. Developed in 1983 by Kary Mullis‚[1][2] PCR is now a common and often indispensable technique used in medical and biological research labs for a variety of applications.[3][4] These include DNA cloning for sequencing‚ DNA-based phylogeny‚ or
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as native metals B reactive C expensive to extract from their ores D likely to donate electrons Question 9. Which of the following equations represents the process occurring at the positive electrode during the extraction of magnesium by electrolysis of molten magnesium chloride? A Mg2+ + 2e– Mg B Mg Mg2+ + 2e– C 2Cl– Cl2 + 2e– D Cl2 + 2e– 2Cl– Question 10. Which of the following metals would usually be extracted from
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While You Read… : How long will the trip take?: The mission trip in The Martian had taken 549 sols in Mars’ time and 687 days in Earth’s time. Mark had been abandoned since Sol 6 and was rescued on sol 549. How would we get back?: In The Martian‚ the circumstances of Mark Watney being left on Mars had caused the travel back to Earth to be different than if everyone had left Mars at the same time. In The Martian‚ The crew of the Ares 3 mission‚ excluding Mark‚ had left Mars as how the order and
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HOMEWORK EXAM 3: Chapter 19: The half life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later? Answer 0.166 0.125 0.062 here 0.015 Which relation is not correct? Answer 11p = 11H = proton 0-1e = 0-1β = electron here +10e = +10β= positron 10n = neutron As a result of beta decay‚ the product nucleus is Answer one atomic number lower than the original element. two atomic number
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called "electrodeposition“. • It’s a process using electrical current to reduce cations of a desired material from a solution and coat that material as a thin film onto a conductive substrate surface. • The overall process is also known as electrolysis. OBJECTIVE • To apply thin films of material to the surface of an object to change its external properties such as to increase corrosion protection‚ increase abrasion resistance‚ improve decorative quality or simply to deposit a layer which
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1) What is the purpose of ice or cold water? To cool down the gas so that it condenses and turns into a liquid. 2) when the gas collecting tube is upside down‚ give a property of this gas. It is less dense than air. 3) Why is a pencil used in drawing the origin line in chromatography? If pen was used‚ it will dissolve giving colours and so‚ the experiment won’t be accurate. Pencil doesn’t interfere with the results. 4) When using ethanol‚ give a better apparatus arrangement‚ and why? Cover
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EXECUTIVE SUMMARY This is a report on hair service industry. Salons and shops in this industry can be privately owned‚ franchised‚ or a chain. According to HOOVERS‚ In the US‚ about 70‚000 hair care salons (65‚000 beauty salons; 5‚000 barber shops) generate combined annual sales of about $19 billion. The top major companies are Premier Salons‚ Ratner Companies‚ Regis Corporation‚ and Sport Clips. The industry is highly fragmented: the 50 largest companies generate about 15 percent of revenue
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PAHANG TRIAL 2009 EXAMINATION CHEMISTRY PAPER 2 MARKING SCHEMES SECTION A - Structural Questions: Question 1. (a) (i) The presence of isotopes 1M (ii) Let the abundance of 63X be a %. The % abundance of 65X. = ( 100 – a ) 1M Relative atomic mass = ( 62.93 x a) + ( 64.93 x ( 100 -a) ) 1M
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Revision checklist for IGCSE Chemistry 0620 A guide for Students Revision checklist for IGCSE Chemistry 0620 A guide for students How to use this guide The guide describes what you need to know about your IGSCE Chemistry examination. It will help you to plan your revision programme for the theory examinations and will explain what the examiners are looking for in the answers you write. It can also be used to help you to revise by using tick boxes in Section 3‚ ‘What you need to know’‚ to check
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i CHAPTER 36: ENVIRONMENTAL CONCERNS LECTURE OUTLINE 36.1 Human Use of Resources A resource is anything from the biotic or abiotic environment that helps meet certain basic human needs. Nonrenewable resources are limited in supply. Renewable resources are not limited in supply. A side effect of resource consumption can be pollution. Land Use Change People need a place to live. Beaches and Human Habitation At least 40% of the world population lives within 100 km of a coastline
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