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    THE KEY ROLES OF CELL DIVISION The ability of organisms to reproduce best distinguishes living things from nonliving matter. The continuity of life is based on reproduction of cells‚ or cell division. In unicellular organisms like amoeba‚ division of one cell reproduces the entire organism. Multicellular organisms depend on cell division for: — Development from a fertilized cell — Growth — Repair Cell division is an integral part of the

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    Thalidomide Aim To appreciate that poor science can be harmful to people. Read the passages on thalidomide from the Internet and answer the questions that follow. 1 Thalidomide is a drug which was sold during the 1950s[->0] and 1960s[->1] as a sleeping aid and given to pregnant women to combat morning sickness[->2] and other symptoms. It was made in West Germany[->3] in 1953[->4]. It was available in around 50 countries‚ although not in the United States[->5]‚ under at least 40 different names

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    Hypothesis: I predict that the leaves taken from the outer area of a shrub have a higher stomatal index (/density) than those taken from the centre of a shrub this are due to light levels. Explanation: Plants have stomata to obtain carbon dioxide from the atmosphere and remove oxygen produced in photosynthesis. During photosynthesis the chloroplasts in the leaf cells synthesize as a result of exposure to light‚ while oxygen is produced as a by-product. As the outer leafs are exposed to higher light

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    Genetic Traits Exercise: Introduction: The pioneer of modern day genetics was an Austrian Monk named Gregor Mendel‚ who established the basic laws of heredity from his studies with pea plants in the late 1800s. Mendel’s fundamental genetic principles may be applied to a variety of traits from many different organisms. Each genetic trait‚ such as flower color‚ is regulated by a pair of genes called alleles. These alleles are found at particular places on the chromosomes called loci. During meiosis

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    Unit 5 Case Study Mariella Hines is a 9 year-old African-American girl attending the 3rd grade in the JFK School. She was referred to the School Psychologist because she has recently become very withdrawn during class‚ refusing to speak to anyone‚ including her teacher and peers. Previously she seemed to have age-appropriate social skills‚ interacting well at school. Her withdrawal started suddenly. Mariella’s teacher‚ Mrs. Levine‚ called Mariella’s mother to find out more information‚ but her

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    Study Questions: Chapter 28 1.) Archaea and Bacteria are the oldest‚ structurally simplest and most abundant forms of life. 2.) Name and describe seven ways in which prokaryotes differ substantially from eukaryotes? Unicellularity- fundamentally single-celled Cell Size- can vary (large range changes with species) Nucleoid- lack a membrane-bound nucleus but rather a nucleoid region Cell Division/Genetic Recombination- binary fission (does not use spindle) and do not have a sexual cycle Internal

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    Salters Nuffield Advanced Biology AS Revision summary Unit 1 Topic 1: Lifestyle‚ health and risk Topic 2: Genes and health Unit 2 Topic 3: Topic 4: SNAB Biology AS Revision Summary Understanding the specification The following summary tries to explain what is meant by the specification statements for the SNAB AS course. SNAB includes a lot of material because it helps you to understand ideas or because it is interesting‚ but it can be a little confusing when it comes to knowing what to

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    It is ironic that Kapil Sibal declared at 125th Birth Anniversary celebrations of great Mathematician Srinivasa Ramanujan that exam-centric education system would have to go. One wonders what Ramanujan himself would say – “Mr. Minister‚ even I am a product of exam centric education system”? Kapil Sibal says he would like to replace the current system with a child-centric one. Now that is a very interesting term. So how does the minister define the term? Expressing his determination to do away

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    # 49 Diet The food an animal eat everyday is called diet. Most animals need 7 types of nutrients in their diet: carbohydrates‚ proteins‚ fats +  water‚ fibre‚ vitamins‚ minerals. The amount of energy needed is provided mainly by our carbohydrate and fat intake. Your dietary requirements depend on your age‚ sex and activity. - Age: The energy demand increases until we stop growing. While children are growing they need more protein per kilogram of body weight than adults do. - Sex: Generally

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    Dry Wallum The dry wallum is a harsh environment that is battered by the sun and wind every day and with a base of porous sand; water availability is very scarce and must be conserved. The abiotic factors in the dry wallum are that the area is exposed to high amounts of sunlight which causes a loss of water in the leaves through transpiration. Since the wallum is so dry and hot; bush fires play a major cycle in the dry wallum which the trees have adapted to cope with. The roots of the plant and

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