Cells and Cell Theory

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Cells and Cell Theory
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Leeuwenhoek

• 1673-1723
• Anton van Leeuwenhoek
• described live microorganisms
• observed in teeth scrapings, rain water ,and
  peppercorn infusions.

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The First Observations

• 1665 Robert Hooke
• reported that living things were
• composed of little
• boxes or cells.

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Schleiden Schwann

• Development of the CELLTHEORY
• Matthias Schleiden (1838) using a microscope
  proposed that all plants are composed of cells
• Theodor Schwann (1839) using a microscope
  proposed that all animals are composed of cells
• Together they stated
• Cells are the elementary particle of all living
  organisms
• All cells are alive independent to the
  organisms to which they belong

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Virchow

• 1858, Rudolf Virchow
• said cells arise from preexisting cells.

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Cell Theory

• Cell Theory
• 1. All living things are composed of one or
• more cells
• 2. Cells are the basic units of structure
• and function in an organism
• 3. Cells come only from the reproduction
• of preexisting cells
• Named for the Monk prayer cells

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Cells

• Eukaryotic versus Prokaryotic Cells
• Prokaryotic - Cells lacking a nucleus.
• Eukrayotic - Cells containing a nucleus.
• Organelles - Membrane-bound bodies found
  within eukaryotic cells.

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Types of Cells

• Two Basic Types of Cells
• Prokaryotes
• prounounced pro-carry-oats
• Eukaryotes
• Proun you-carry-oats

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Eukaryotes

• Eukaryotes
• Larger more complex cells that make up most
  familiar life forms
• plants, animals, fungi, algae
• Surrounded by a cell
• membrane made of
• lipids

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Prokaryotes

• Smaller
• No true nucleus loose genetic material
• Includes Archaea Bacteria

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