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Cell History

Cell History. van Leeuwenhoek. Hooke. Cell History. All life is made of cells Cells discovered after microscope invented 1665 : Robert Hooke first observed cork (dead tree bark) Boxes he saw reminded him of tiny rooms He named the empty boxes “cells”. Cell Theory. Schleiden.

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Cell History

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  1. Cell History van Leeuwenhoek Hooke

  2. Cell History • All life is made of cells • Cells discovered after microscope invented • 1665: Robert Hooke first observed cork (dead tree bark) • Boxes he saw reminded him of tiny rooms • He named the empty boxes “cells”

  3. Cell Theory Schleiden • Three Parts: • 1) All organisms are made of cells • 2) The cell is the most basic unit of life • 3) Cells come from other cells • What’s the big problem with this theory? Schwann Where did the 1st ever cell come from? Virchow

  4. Cell Diversity • Shape depends upon function • ex: Nerve Shape: Elongated branching • Function: Sends messages to and from brain • ex: Red Blood Shape: Disc-like shape prevents clogging • Function: Carries O2 throughout blood • ex: Skin Shape: Flat & broad; layers overlap • Function: Covers and protects the body

  5. Cell Categories • 1) Prokaryote: Cells without a nucleus and other membrane-bound organelles • First cells/life on Earth (oldest fossils = ~3.6 b.y.o) • AKA: Bacteria

  6. 2) Eukaryote: Cells with a nucleus & membrane bound organelles More complex cells Evolved from prokaryotes Ex: Protists, Fungi, Plants, Animals Cell Categories

  7. Prokaryotes vs. Eukaryotes

  8. Review • Who first identified cells? • What was he/she examining? • Name the three parts to the cell theory. • Explain how the shape of a blood cell allows it to perform it’s job better. • Which category of cells contain nuclei? • Why are bacteria considered the oldest forms of life on Earth? • How do prokaryotes and eukaryotes differ?

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