Cell

Cell

Discovered by Robert Hooke in 1665, "little rooms" were described as cells within a cork sample
1. Antoine Leeuwenhoek described cells from blood, sperm, and pond water, using more refined microscope lenses
  1. Important People
Visible light passes through a specimen, then through glass lenses, and then finally a viewer's eye when using a light microscope, which was the first microscope created, specimens can be magnified by 1000 times
1. To view the structure of cells using electron beams, scientists created the electron microscope. Magnified up to 1,000 times
  1. Microscopes that study the detailed architecture of cell surfaces are called Scanning Electron Microscopes (SEM)
  2. Microscopes that study the of internal cell structures are called Transmission Electron Microscopes (TEM)
2. Types of Microscopes
Increase in an object's image size in comparison to its actual size is magnification
1. The measure of the clarity of an item is called resolution
  1. Vocabulary Words
Cell Theory
1. 1) All living things are composed of cells
  1. 2) All cells come from other cells
    1. 3) Cells are the most basic unit of life
      1. Viruses
        The exception to the cell theory (if alive)
        On going debate on whether or not they are alive
Cell Size
1. Must be large enough to house DNA, protein, and structures essential to survival and reproduction
2. Must be small enough to allow for a surface-to-volume ratio that will allow adequate exchange with the environment
3. Surface Area to Volume Ratio
  1. Gets smaller as the cell gets larger
  2. Gets larger as cell gets smaller
  3. Surface Area: (6)(LW)
  4. SA/V
  5. Volume: (L)(W)(H)

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	Created by Allyson Woody over 9 years ago