Cell Theory Discussion
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Cell Theory Discussion



PPT of the basic cell info and the cell theory

PPT of the basic cell info and the cell theory



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Cell Theory Discussion Cell Theory Discussion Presentation Transcript

  • Cells Organization of Life Discovery of Cells Cell Theory Prokaryotic vs. Eukaryotic
  • Organization of Life
    • Put your cards in order from least complex to most (what is made from what?)
    Cell Tissue Organ Organ System Organism
  • Organization of Life Cell Tissue Organ Organ System *Organism can be made of one cell or many organ systems. Smallest unit that can carry out life’s activities Group of cells working together to perform specific job Group of tissues working together to perform specific job Group of organs working together to perform specific job Organism*
  • Discovery of Cells
    • Most cells cannot be seen with naked eye
    • So how were they first discovered?
    • What was needed for their discovery?
  • Cells Discovered
    • 1665 - Robert Hook discovered cells by accident
    • Hook built a basic microscope to look at small things
    • Looked at cork from a tree
  • Discovery of Cells
    • 1673 - Anton van Leeuwenhoek looked at pond scum and saw small creatures
    • Leeuwenhoek also saw that blood cells differed between animals, saw bacteria, and realized that yeast was alive
    • 1838 – Schleiden concluded that all plant parts are made of cells
    • 1839 – Schwann stated all animal tissues are made of cells
  • Cell Theory
    • 1839 - Schwann developed beginning of CELL THEORY
      • All organisms are composed of one or more cells.
      • The cell is the basic unit of life in all living things.
    • 1858 – Virchow added to CELL THEORY
      • All cells come from existing cells
    Make a timeline of Cell Discovery
  • All Cell’s Have…
    • Cell membrane – barrier between inside and outside of cell; controls passage of things in and out of cell
    • Hereditary material – all cells contain DNA and pass a copy to new cells
    • Organelles – all cells have chemicals and structures that let the cell live, grow and reproduce
    • Cytoplasm - a fluid surrounding their structures
  • Classification of Cells Cells Animal Cells Plant Cells Bacteria Eukaryotic Prokaryotic Other Cells Unicellular Organisms Multicellular Organism Other Cells
  • Two Types of Cells
    • Prokaryotic – no nucleus
    • Eukaryotic – have a nucleus
  • Prokaryotic
    • Bacteria
    • Smallest cells
    • No nucleus
    • Long, circular DNA
    • Probably first type of cells on Earth (3.5 billion years old fossils)
  • Eukaryotic
    • More complex
    • All living things (except bacteria) are made of one or more eukaryotic cells
    • Have nucleus and many membrane-covered organelles
    • Nucleus stores linear DNA
    • All have cell membrane, some have cell wall also