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History of Cell Biology and Types of Cells

History of Cell Biology and Types of Cells. Pgs. 69-71. Cells. Smallest unit that can perform life processes Random Facts Average human is composed of 100 trillion cells It would take 50 cells to cover the dot of an “i” on your paper. Who discovered cells?. 1. Hooke, 1665.

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History of Cell Biology and Types of Cells

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  1. History of Cell Biology and Types of Cells Pgs. 69-71

  2. Cells • Smallest unit that can perform life processes • Random Facts • Average human is composed of 100 trillion cells • It would take 50 cells to cover the dot of an “i” on your paper

  3. Who discovered cells?

  4. 1. Hooke, 1665 • Discovered cells while looking at cork (plant cells) • Described them as tiny boxes or rooms • “cell” means little room in Latin • Thought cells only existed in plants and fungi

  5. 2. Leuwenhoek, 1673 • Observed pond scum & found single-celled organisms • One of the first to look at living cells • He called them “animalcules”

  6. 150-200 Year Gap….Not much was discovered • Between the Hooke/Leuwenhoek discoveries and the mid 19th century, very little cell advancements were made.

  7. 3. Schleiden, 1838 • German botanist • Stated that all plants are made up of cells

  8. 4. Schwann, 1839 • German Physiologist • Stated that all animals are made up of cells

  9. 5. Virchow, 1858 • German Physician • Studied cellular pathology • Concluded that cells must come from existing cells

  10. Cell Theory 1. All living things are made up of one or more cells (Schleiden & Schwann 1838-39)

  11. Cell Theory 2. Cells are the basic units of structure and function in living things. (Schleiden & Schwann 1838-39)

  12. Cell Theory: 3. All cells are produced by the division of existing cells

  13. Cell Types and Common Parts

  14. TPS: What differences do you notice?

  15. Type of Cells Type of Cells • Prokaryotic: lack membrane-bound organelles • Unicellular • Simple • Capsule, cell wall, cell membrane • No nucleus • Cytoplasm (also in eukaryotes) • Ribosomes (also in eukaryotes) • Cilia, flagella (for movement) (also in eukaryotes) • Oldest living cells • Ex: bacteria

  16. Prokaryotic

  17. Type of Cells Type of Cells • Eukaryotic: contain a membrane-bound nucleus and organelles • Unicellular and multicellular • More complex • Ex: Animal and plant cells

  18. Size difference Prokaryote Eukaryote

  19. All cells have the following in common 1. Plasma (cell) Membrane • Acts as a barrier to the outside world • Semi-permeable: allows only certain materials to leave and enter

  20. All cells have the following in common 2. Cytoplasm • Gel-like substance • Fills space in the cell • Most reactions happen here 3. DNA • Regulates cells function • Stores and transfers genetic information

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