w w w e tr .X m eP e ap .c rs om June 2003 GCE A AND AS LEVEL MARK SCHEME MAXIMUM MARK: 40 SYLLABUS/COMPONENT: 9700/01 BIOLOGY Paper 1 (Multiple Choice) Page 1 Mark Scheme A/AS LEVEL EXAMINATIONS – JUNE 2003 Syllabus 9700 Paper 1 Question Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Key D A C C A C D A B A B C B C D A D A C C Question Number 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Key D B B A C C B B C D A C C D B B D B B C
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is called chromatography. The materials used consisted of – 3 pieces of chromatography paper‚ a tall clear glass‚ water‚ table salt‚ 1 tsp. measuring spoon‚ an 8 oz. measuring cup‚ pencil‚ ruler‚ 6 washable markers‚ and paper towels. The markers used in this experiment have to be water soluble therefore I used washable markers made by Crayola. The colors I chose were brown‚ teal‚ red‚ orange‚ black‚ and green. The salt solution served as the mobile phase while the chromatography paper served as
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Chromatography of Food Dye Chem 180-DL3 Abstract: The goal of this experiment was to use different dyes to determine the Rf value. Chromatography is done to determine the presence of a mixture in a substance. In this experiment different dyes were used such as McCormick food coloring‚ M&M’s‚ Kool-Aid‚ and the dyes that came with the lab kit. Experiment and Observation: In this experiment a 50mL beaker was filled with luke warm water and a pinch of salt water was dissolved in it
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Unit 1 Diversity 1. List the 6 kingdoms for classifying living things. 2. List the levels of organisation from kingdom to species. 3. What is binomial nomenclature? 4. Who is Carl Linnaeus? 5. What is a dichotomous key? 6. Draw and label the lifecycle of a DNA virus. 7. Distinguish between DNA and RNA viruses. 8. Compare eukaryotic cells and prokaryotic cells. 9. Define coccus‚ bacillus‚ streptococcus‚ and spirillum? 10. What are 3 examples of helpful bacteria? 11. What do bacteria need
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processes involved in photosynthesis. (6 marks) (ii) Identify TWO characteristics of the leaf that make it an effective photosynthetic organ and state how EACH characteristic mentioned facilitates photosynthesis. (4 marks) (iii) How is it possible for a plant to survive after losing all of its leaves? (2 marks) (b) The phenomenon of swarming occasionally occurs in some insect species‚ such as locusts. At such times locusts occur in very large numbers and they attack vegetation including crops. (i) Explain
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Title: Thin-Layer Chromatography Objectives: Part1: 1. To learn the technique of TLC and the visualization of colourless components. 2. To identify an unknown drug by a TLC comparison with standard compounds. Part 2: To learn the separation technique by using Thin Layer Chromatography plate in separating a mixture of compounds into individual pure compound by using Spinach Leaf. Introduction: (i) General Concepts Chromatography is a common and powerful method used to separate and analyze complex
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Bouwmeester5‚6‚ Guillaume Becard1‚ Christine A. Beveridge3‚7*‚ Catherine Rameau2* & Soizic F. Rochange1* A carotenoid-derived hormonal signal that inhibits shoot branching in plants has long escaped identification. Strigolactones are compounds thought to be derived from carotenoids and are known to trigger the germination of parasitic plant seeds and stimulate symbiotic fungi. Here we present evidence that carotenoid cleavage dioxygenase 8 shoot branching mutants of pea are strigolactone deficient and
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Banlawe‚ Ivane Ann P. David‚ Joana Haizan G. Landicho‚ Lloyd Charles L. Mapuá Institute of Technology 2012 LE Design Verification Table of Contents Table of Contents Cover Page i Table of Contents ii I. Introduction 1 II. Running DRC (Design Rule Check) 2 III. Running LVS (Layout Versus Schematic) 5 IV. Running LPE (Layout Parasitic Extraction) 8 V. Reference Compiled by: Banlawe‚ Ivane Ann P. David‚ Joana Haizan G. Landicho‚ Lloyd Charles
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CONSTRUCTION SITE Safety Manual for Condominium Housing Development at 21 Nathan Road‚ Singapore |Index |Date |Revision |Prepared | |01 |2010-6-21 |First Edition | C O N T E N T S Section Title 1. Introduction 2. Responsibility on Site 3. Cleanliness of Site and
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Information and Research 1. Chromatography is an analytical methor or technique that serves mainly as a tool for the examination‚ separating and identifying mixtures of chemical substances that are or can be coloured. 2.check the presence of any contamination in the manufactured compounds h as medicine‚ Contaminants in rainwater Analysis of narcotics Detection of substances in urine http://en.wikipedia.org/wiki/Paper_chromatography http://www.chemguide.co.uk/analysis/chromatography/paper.html http://chem
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