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Transcript
7.1 Cell Discovery and Theory What is The Cell Theory? All organisms are composed of one or more cells. The cell is the basic unit of structure and organization of organisms. All cells come from preexisting cells. How are Light Microscopes Used? Utilizes a series of glass lenses and visible light to magnify an image High Power 400 X Low Power 100X How are Electron Microscopes Used? Utilizes magnets to aim a beam of electrons at a cell to produce an image Magnifies images up to 500,000 times the actual size 9560x Microscopy Links http://biologygmh.com/ What is a Prokaryotic Cell? Simple structure Contains a plasma membrane Does not contain membrane-bound organelles BACTERIA 11,000x What is a Eukaryotic Cell? More complex structure Contains a plasma membrane Contains membranebound organelles PLANTS AND ANIMALS 400x Are Viruses Alive? • A nonliving strand of genetic material within a protein coat • No organelles to take in or use energy, must use energy from host cell • Can not move • Can not make proteins • Can not replicate on their own How are Prokaryotic Cells, Eukaryotic Cells and Viruses Different? Structure Prokaryotic Cells (Bacteria) Eukaryotic Cells (plant and animal) Viruses DNA DNA floats in cytoplasm in enclosed loop Membrane bound nucleus w/ DNA DNA surrounded by protein coat Membrane or Cell Wall Cell Membrane and a cell wall Cell membrane and maybe a cell wall No cell membrane or a cell wall Energy Production In cell membrane No mitochondria In mitochondria Gets energy from host cell Reproduction Asexual or Sexual Asexual or Sexual Asexual only, obligate intracellular parasite Chapter 7 Cellular Structure and Function Vocabulary Section 1 cell cell theory plasma membrane prokaryotic cell eukaryotic cell organelle nucleus