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Cell Theory & Endosymbiosis: A Journey into Cellular Discovery

Explore the fascinating world of cells through the discovery of the cell by Robert Hooke in 1665, the Cell Theory postulating that all living organisms consist of cells, and the Endosymbiosis Theory proposing the origin of organelles. Learn about the differences between prokaryotic and eukaryotic cells, the nature of bacteria and viruses, and the impact of endosymbiosis on the diversity of protists.

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Cell Theory & Endosymbiosis: A Journey into Cellular Discovery

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  1. Review… • Hypotonic Solution: more solute _______ the cell • What happens to the cell? • Hypertonic Solution: More solute _______ the cell • What happens to the cell?

  2. PRO vs. EUK • Differences? • Bacteria are…. • Plant and Animal are… • Who discovered Cells?

  3. Bacteria/Virus • Are viruses living or non-living? • Are Bacteria living or non-living? • Are Bacteria larger or smaller than viruses?

  4. Bacteria Cell

  5. Cell Theory & Endosymbiosis

  6. The Cell • First discovered by Robert Hooke in 1665 • Pieces of cork – he actually saw the cell walls of the plant cells

  7. Cell Theory • All living organisms are composed of 1 or more cells. • Cells are the basic unit of structure and organization of all living organisms. • Cells arise only from previously existing cells, with cells passing copies of their genetic material on to their daughter cells.

  8. Endosymbiont Theory • This theory says that certain unicellular organisms engulfed other cells. These engulfed cells become organelles in the host cell. • Lead to the diversity of Protist (Plant-like, Animal-like, Fungus-like) • First proposed in the 1960’s by Lynn Margulis

  9. Evidence of Endosymbiosis • Pg. 576 • The first Eukaryotes acquired mitochondria & chloroplast by engulfing a prokaryote • Mitochondria & chloroplast have their own DNA & ribosomes b/c they were once Prokaryotic cells.

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