Cell lecture 1
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Cell Lecture #1. What Are Cells? History of Cells. What is a Cell?. A cell is the basic unit of structure and function in living things. Invention of microscope made seeing cells possible. History of Cell Discovery.

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Cell Lecture #1

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Cell Lecture #1

What Are Cells?

History of Cells


What is a Cell?

  • A cell is the basic unit of structure and function in living things.

  • Invention of microscope made seeing cells possible


History of Cell Discovery

Robert Hooke gets credit for discovering cells by looking at cork - he thought they looked like “prison cells”


Anton van Leeuwenhoek

  • This Dutch scientist discovered little things swimming in pond water which he called “animalcules” (little animals) with microscopes he made himself


Three parts to the Cell Theory

  • 1.All living things are made of cells

  • 2.All cells come from other cells

  • 3. The cell is the basic unit of structure and function in living things


Early Cell Scientists

  • 1.Matthias Schleiden discovered that all plants were made of cells in 1835

  • 2. Theodore Schwann discovered that all animals were made of cells in 1836


Early Cell Scientists (cont)

  • 3. Rudy Virchow discovered that all cells come from other cells in 1855;His rule - Omnis cellula e cellula ("every cell originates from another cell")


Main Types of Microscopes

  • Light microscopes bend light rays through convex lenses. They are powerful because you multiply the powers of each lens to get total magnification


Electron Microscopes

  • Electron Microscopes use a focused beam of electrons instead of light allowing for much increased magnification. Unfortunately it kills the specimen if it is alive.


Scanning Electron Microscope Pics


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