7/6/2011 CELL DIVISION CHAPTER 3: CELL DIVISION 3.1 THE CONCEPT OF CELL DIVISION 3.2 THE CELL CYCLE 3.3 MITOSIS 3.4 MEIOSIS Related to the theory of cells Rudolph virchow ; 1855 stated; „Omnis cellula e cellula‟ Every cell is from a cell or “All new cells are derived from other cells” A cell (daughter cell) is originated from another cell ( ) through . In cell division‚ is inherited from one generation to the next. Involve the distribution of genetic material (DNA) to each daughter
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Cell phones and their everyday use. The invention of cell phones has enabled us to improve our lives in many ways which can be great for some but for others has caused irresponsibly behavior. Most of the time they allow us to multitask but for some it is just a distraction. Cell phones have had a major impact on our lives both positive and negative. They affect how we handle our everyday tasks. They can be entertaining most of the time with all the cool features‚ or help us regarding safety
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imagine how life would be without cell phones. Very few people don’t comprehend how much that would affect us. At one point in life people used to mail each other letters to get messages back and forth from one person to another. In this current century those methods has been added to the cell phones. Research Question: How have cell phones changed us socially? How have cell phones impact our lives? Source: South University Online This article showed how cell phones impacted our lives today
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The fluid mosaic model of the cell membrane. What is the fluid mosaic model? The fluid mosaic model is a model conceived by S.J. Singer and Garth Nicolson in 1972 to describe the structural features of biological membranes. The membrane is described to be fluid because of its hydrophobic integral components such as lipids and membrane proteins that move laterally or sideways throughout the membrane. That means the membrane is not solid‚ but more like a ’fluid’. The membrane is depicted as mosaic
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Cell Structure and Function Chapter Outline Cell theory Properties common to all cells Cell size and shape – why are cells so small? Prokaryotic cells Eukaryotic cells Organelles and structure in all eukaryotic cell Organelles in plant cells but not animal Cell junctions History of Cell Theory mid 1600s – Anton van Leeuwenhoek Improved microscope‚ observed many living cells mid 1600s – Robert Hooke Observed many cells including cork cells 1850 – Rudolf Virchow
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Significance * The cell phone has become a common product. Almost everyone has a cell phone‚ and they have only been around 35 years and popular for about 15. Yet‚ they have become an indispensable part of daily life. It ’s hard imagining what many would do without them. Function * A cell phone ’s basic function is to make and receive calls from anywhere you have service. Even though they can do more‚ calling is their main function. This function enables a person to make or receive a call
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CELL INJURY: CAUSES OF CELL INJURY‚ MECHANISMS OF REVERSIBLE AND IRREVERSIBLE CELL INJURY. CELL INJURY. Causes of cell injury range from gross mechanical external causes to mild endogenous causes as genetic lack of enzymes etc. Virtually all forms of tissue injuries start with molecular or structural alterations in cells. Under normal conditions‚ the cells are in: ❖ homeostastatic „steady“ state Normal cell is confined to relatively narrow range of functions and structure by
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Biology- Animal cell The NUCLEUS is the largest organelle in the majority of cells. It contains genetic information in DNA‚ which is responsible for the cells unique characteristics. The nucleus is separated from the rest of the cell by.... ...The NUCLEAR ENVELOPE is used as a barrier which separates the contents of the nucleus from the cytoplasm‚ all in all keeping the DNA safe and intact. The nuclear envelope regulates the flow of substances into and out of the nucleus. The NUCLEOLUS is an important
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Living Environment/Biology A Tour of the Cell CellsTissuesOrgansOrgan SystemsOrganisms *Cells are made up of smaller functional parts known as cell organelles (little organs). Cell organelles are specialized cell structures that perform specialized jobs in the cell.* 1. Cytoplasm- *Jelly-like substance inside of the cell 2. Mitochondria- *In cellular respiration oxygen is used to extract energy from sugars‚ fats‚ and other nutrients 3. Cell membrane- *It is a selectively permeable
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Experiment title: Preparation of Biological Materials for Microscopic Examination Objectives: 1. To learn how to use a microscope. 2. To study the cell structure of starch grains‚ onion cells and cheek cells. 3. To differentiate the difference between starch grains‚ onion cells and cheek cells. Introduction: Microscope is an optical instrument use to magnify micro objects that hardly or impossible to be observed by naked eyes‚ so that the objects can be studied. Compound light microscope
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