Centre No. Candidate No. Paper Reference(s) Surname Initial(s) Signature 4325/2H Examiner’s use only London Examinations IGCSE Biology Paper 2H Team Leader’s use only Higher Tier Wednesday 11 May 2005 – Morning Time: 2 hours Question Leave Number Blank 1 2 3 4 5 Materials required for examination Nil Items included with question papers Nil 6 7 8 Instructions to Candidates In the boxes above‚ write your centre number and candidate number‚ your surname
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HOW CAN CANCER CELLS BE RECOGNIZED? NAME: _______________________________ DATE: __________________ BLOCK: _______ Purpose: In this investigation you will explore the similarities and differences between the cell cycles of normal cells and cancer cells. Procedure: 1. Open your Internet Browser and navigate to the following URL: http://glencoe.mcgraw-hill.com/sites/0078695104/student_view0/unit2/chapter9/virtual_labs.html 2. Click on CELLULAR REPRODUCTION TV/VCR 3. Click on the TV/VCR. a. b.
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SBI3U1-04 Final Exam Study Notes Unit 1: Diversity of Living Things 1.1 Importance of Biodiversity Spotlight on Honeybees Very important‚ pollinate flowers allowing plants to reproduce Play vital role in food chain‚ if they die‚ all organisms that rely on them will die as well Dying because of pesticides‚ parasitic Varroa mite (infects beehives and sucks of bees’ blood)‚ the Israeli acute paralysis virus (immobilizes and kill bees) No genetic diversity = Less resistant to parasites
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Objectives of the Study This study evaluates the genotoxicity‚ and teratogenicity/antiteratogenicity of the methanol leaf extracts of Tamarindus indica (TE). In particular‚ the study aims to: determine the genotoxicity of TE in terms of: mitotic index chromosomal aberrations micronuclei formation assess the developmental toxicity and teratogenicity potential of TE to zebrafish embryos; and verify the potential of TE to rescue zebrafish embryos from ethanol-induced teratogenicity. Place and
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Sept 27‚ 2010 Chapter 4 * With four valence electrons‚ carbon can form four covalent bonds with a variety of atoms * This tetra valence makes large‚ complex molecules possible * Fundamental groups: Alkanes and Alkenes * The electron configuration of carbon gives it covalent compatibility with many different elements * The valences of carbon and its most frequent partners (hydrogen‚ oxygen‚ and nitrogen) are the “building code” that governs the architecture of living
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EFFECT OF TURMERIC PASTE‚ LACTOSE AND NEEM PASTE IN THE CANCEROUS CELL IN MOUSE(STARTED 11/11/2011) (By DAY group—DEEPESH‚Anup and Yogesh MATERIALS * Turmeric paste * Lactose of milk * Neem paste REQUIREMENT * Three rats two cancerous one normal 2011/11/11 * ONIONS WERE KEPT IN WATER IN COUPLING JAR TO SEE IF OUR CHEMICALS AFFECTS THE CELL DIVISION OR NOT……. * ….E.coli was also inoculated but not used later * Neem leaf paste was prepaed in the mixture and kept
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Genetics‚ Evolution and Diversity (GED) Prelim 1st Sem AY 2013-14 Research Portfolio 1. Discuss in words or contrast in graphical/sketch form the differences of Prokaryotic cells from the Eukaryotic cells. 2. Describe in words or show in graphical/sketch form the general features of the cell Nucleus. 3. Briefly discuss each of the five functions of cell nucleus. 4. Illustrate in words or graphical/sketch form the structure (highlight the nucleotide components) of the DNA
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Meiosis is the type of nuclear division that occurs to form four genetically different gametes. This produces genetically different offspring which all differ in traits‚ the reason this occurs is because of the way that the chromosomes are handled to make gametes. The general gist of meiosis is that a homologous pair is split twice to make four separate cells that have the haploid number of chromosomes meaning when they fuse with other gametes they form a zygote with the diploid number of chromosomes
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Title: Physical and Chemical Properties Purpose: The purpose of this experiment is to investigate the physical and chemical properties of pure chemical substances by subjecting them to various environmental extremes. Procedure: Filled each test tube with substances provided and subjected them to various conditions. These conditions included‚ heat‚ cold water‚ hot water‚ acid and basic additions and tested on litmus paper. The reactions were observed and documented at each step. Data tables:
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Name: |Date:| Exp 1: Observations of Chemical Changes|Lab Section: | Data Tables: Part 1: |Chemicals|Well No.|Observations of the Reaction| A.|NaHCO3 + HCl| H12|White and bubbled slightly and settled down to smaller smaller bubbles| B.|HCl + BTB| H11|Golden yellow; looked darker under the black paper| C.|NH3 + BTB|H10 |Dark blue| D.|HCl + blue dye| H9|Greenish color| E.|Blue dye + NaOCl| H8|Blue and lighter than NH3+BTB solution color| | with the 1 drop of HCl| H8|Turned blue green
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