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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Hook: Since the dawn of time man has consumed foods which were given to us by nature but now in the modern age we resort to consuming foods which were partly made in a chemist’s beaker. Direction of Arguments: Food additives have were in use for centuries in process of pickling or preserving using vinegar or salt but recently it has taken a turn for the worst invading almost all the processed foods we consume. Arguments: 1. Lead to physiological disorders 2. Are known to cause to foods to
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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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bacterium Single-celled organism belonging to the Domain Bacteria; cells are typically walled and do not contain a nucleus. * biodiversity Of a region‚ the genetic variation within its species‚ variety of species‚ and variety of ecosystems. * biology The scientific study of life. * biosphere All regions of Earth where organisms live. * cell Smallest unit that has the properties of life; at minimum‚ consists of plasma membrane‚ cytoplasm‚ and DNA. * community All populations
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Potato Enzyme Lab Enzymes are protein catalysts that speed up chemical reaction in living organisms. The purpose of this lab was to; observe the breakdown of hydrogen peroxide toxin by potato’s enzyme catalase‚ determine factors that influence how quickly the reaction takes place‚ and determine factors that influence how well enzymes function. The first test‚ we were supposed to see what would happen when we add sand in hydrogen peroxide. We filled a test tube with 5mL hydrogen peroxide and we added
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ENZYME STRUCTURE AND FUNCTIONS: Enzymes are biological catalysts. They increase the rate of reactions by a factor of between 106 to 1012 times‚ allowing the chemical reactions that make life possible to take place at normal temperatures Definition of enzyme: A protein with catalytic properties due to its power of specific activation is defined as an enzyme. STRUCTURE Enzymes are proteins their function depends on its complexity. The reaction takes place in a small part of the enzyme
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