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Cells and Life

Cells and Life. September 7, 2012. Objectives. I can summarize cell theory. I can identify the characteristics of life. Cells are the smallest unit of life. Most cells are so small you cannot see them without some type of magnifying device.

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Cells and Life

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  1. Cells and Life September 7, 2012

  2. Objectives • I can summarize cell theory. • I can identify the characteristics of life.

  3. Cells are the smallest unit of life. • Most cells are so small you cannot see them without some type of magnifying device. • For a very long time, people did not know that cells existed.

  4. Seeing Cells! • Light Microscope (around 1600) • Magnifies 1,500 times original size. • 1665 Robert Hooke observes cells. • Cannot see all the structures of the cell.

  5. Seeing Cells! • Electron Microscope (1930 s) • Able to see most structures inside the cell. • Magnifies 100,000 times original size! • Ruska and Knoll in Germany

  6. Cell Theory • In the 1830 s German scientists Schleiden and Schwann found that plants are made of cells and animals are made of cells. • German scientists also proposed that cells come from preexisting cells.

  7. Cell Theory • All organisms are made of one or more cells. • The cell is the smallest unit of life. • All new cells come from preexisting cells.

  8. Characteristics of Life • Living things must exhibit all the characteristics of life: Organization, Responses, Growth and Development, Reproduction, Homeostasis, and Energy.

  9. Organization

  10. Response

  11. Growth and Development

  12. Reproduction • Re/produce “create again”

  13. Homeostasis Homeo/stasis “stay the same” -Organisms work to keep the internal conditions within certain limits.

  14. Energy

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