The Cell
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The Cell

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The Cell The Cell Presentation Transcript

  •  
  • Cells
  • Cells
    • All living things are made of cells
    • All cells come from preexisting cells
    • Cells are the basic structural and functional unit of life (Cell Theory)
  • Structure and Function
    • A cell’s structure (shape and size) is directly related to its function
    • Skin cells are “plate like”
    • Nerve cells are long and branchy
  • Cell Size
    • Cells are relatively small because they must maintain a high surface area (cell membrane) to volume (cytoplasm) ratio
    • If a cell gets too large it will STARVE
  • Prokaryotes
    • Prokaryotes are organisms whose cells lack a “true” nucleus
    • These cells are usually small and simple
    • Example: Bacteria
  • Eukaryotes
    • Eukaryotes are organisms whose cells contain a “true” nucleus
    • These cells are usually large and complex
    • Examples: Plants, Animals, Fungi, Protists
  • Plant vs. Animal Cells
    • Plant cells have:
      • A Cell Wall (used for structure)
      • A Central Vacuole (used to maintain turgor pressure)
      • And Chloroplasts (needed for photosynthesis)
  • Pulse Check
    • Now that you know so much about cells, try your hand at illustrating each of the following types of cells:
      • Prokaryotic
      • Eukaryotic: Animal and Plant