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Chapter 7: Cell Structure

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Chapter 7: Cell Structure & Function I. Life is Cellular A. The Discovery of the Cell Famous Scientists & the Cell Theory : 1. Robert Hooke (1665) English – PowerPoint PPT presentation

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Title: Chapter 7: Cell Structure


1
Chapter 7 Cell Structure Function
  • I. Life is Cellular
  • A. The Discovery of the Cell
  • Famous Scientists the Cell Theory
  • 1. Robert Hooke (1665) English scientist who
    used an early
  • compound microscope to
  • look at thin slices of cork.
  • -1st used the word cell,
  • referring to tiny, empty
  • chambers that make up plant cork.
  • 2. Anton van Leeuwenhoek Dutch scientist who
    used a single-lens microscope to view pond water
    other things. Was a lens-maker.

2
Famous Scientists the Cell Theory
  • 3. Matthias Schleiden (1838) German botanist
    who 1st concluded that all plants are made of
    cells.
  • 4. Theodor Schwann (1839) German biologist who
    1st concluded that all animals
  • are made up of cells.
  • -Said all living things are made
  • of cells.
  • 5. Rudolf Virchow (1855) German physician who
    concluded that new cells only come from existing
    cells.

3
Famous Scientists the Cell Theory
  • Work done by these scientists
  • led to the development of the
  • cell theory.
  • The cell theory states
  • 1. All living things are made of cells.
  • 2. Cells are the basic unit of structure
    function in living things.
  • 3. New cells are produced from existing cells.

4
B. Exploring the Cell
  • New techniques microscopes
  • are now used to explore the cell
  • closely.
  • Techniques
  • 1. Fluorescent labeling follows molecules
    moving through a cell.
  • 2. Confocal light microscopy scans cells w/
    laser beam used to build 3-D images of cells
    cell parts.
  • 3. High-resolution video technology - produces
    movies of cells as they grow, divide, develop.

5
Types of Electron Microscopes
  • 1. TEMs (transmission electron
  • microscopes) used to study cell structures
    protein molecules.
  • 2. SEMs (scanning electron microscopes) scan
  • surfaces of specimens make 3-D images.
  • 3. Scanning probe microscopes trace surfaces
    of samples with a fine probe. Great for
    surfaces can view single atoms.

6
C. Prokaryotes and Eukaryotes
  • All cells have 2 characteristics
  • 1. Have a cell membrane.
  • 2. Contain DNA.

7
2 Major Divisions of Cells
  • Eukaryotic cells that contain a
  • nucleus and many organelles, ex
  • plant animal cells.
  • -Larger/complex cells that are
  • highly specialized (parts specific
  • functions).
  • -Nucleus stores genetic material
  • separately from the rest of the cell.
  • -Have great variety can be single
  • or multicellular.
  • Prokaryotic cells with no nucleus
  • few organelles, ex bacterial cells.
  • -Usually smaller/simple have
  • genetic material that isnt
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