NOTES: 7.1 - Introduction to the Cell - PowerPoint PPT Presentation

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NOTES: 7.1 - Introduction to the Cell

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NOTES: 7.1 - Introduction to the Cell All living things are composed of 1 or more cells. Cells are the basic unit of structure & function in living things. – PowerPoint PPT presentation

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Title: NOTES: 7.1 - Introduction to the Cell


1
NOTES 7.1 - Introduction to the Cell
2
Cell Theory
  • All living things are composed of 1 or more
    cells.
  • Cells are the basic unit of structure function
    in living things.
  • New cells are produced from
  • existing cells.

3
MICROSCOPES
  • Light Microscope
  • Electron Microscope (1940s)
  • Scanning Electron Microscope
  • Transmission Electron Microscope

4
Light Microscope
  • works by passing visible light through a thin
    section of specimen and then through glass lenses
  • magnification about 1000x - 1500x

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Electron Microscope (1940s)
  • uses electron beams which have shorter
    wavelengths of light (so you can see smaller
    objectsmore detail)
  • magnification up to 500,000x

7
Electron Microscope
  • Scanning Electron Microscope
  • electron beam scans the surface of a specimen
  • useful for studying the surface of specimen in
    3-D
  • Transmission Electron Microscope
  • electrons transmitted through specimen
  • used to study internal cell structure

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Disadvantages to EM
  • can only view dead cells (preparation steps kill
    living cells)
  • very expensive

zooxanthellae cells cultured from coral Aiptasia
pulchella in a Scanning Electron Microscope
10
Cell Types Classification!
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ALL CELLS
  • have a cell membrane
  • have cytoplasm
  • have ribosomes
  • can reproduce contain genetic material

12
CELLS CAN BE CLASSIFIED AS
  • 1. PROKARYOTES
  • 2. EUKARYOTES

See no nucleus!!!
See a nucleus!!!
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NUCLEUS
  • membrane-bound organelle in eukaryotic cells
  • contains the cells DNA
  • enclosed by a nuclear envelope
  • contains all of the information for cell to
    function
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