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The Cell

The Cell. Definition of Cell note: only write down text in red. A cell is the smallest unit that is capable of performing life functions. . Cell Theory. All living things are made of cells. Cells are the smallest living units.

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The Cell

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  1. The Cell

  2. Definition of Cellnote: only write down text in red A cell is the smallest unit that is capable of performing life functions.

  3. Cell Theory • All living things are made of cells. • Cells are the smallest living units. • All cells come from preexisting cells through cell division.

  4. Who came up with this theory? Let’s call these things cells! • Robert Hooke(1665) First person to see cells, he was looking At cork and noted that he saw many boxes That look like prison cells

  5. Who came up with this theory? 2. Schleiden (1838) All plants are made of cells! Onion skin cells

  6. Who came up with this theory? All animals are made of cells! 3. Schwann - 1839 Human red blood cells

  7. Who came up with this theory? 4. Virchow - 1855 All cells come from pre-existing cells!

  8. Examples of Cells Amoeba Proteus Plant Stem Bacteria Red Blood Cell Nerve Cell

  9. How big are cells? • Mostly Microscopic • Measured in microns (µm) • A µm is one millionth of a meter!

  10. How big are cells? • Bacteria (aka E.coli) • Size=1 µm by 3 µm

  11. How big are cells? • Human red blood cell = 8 µm

  12. How big are cells? • Largest cell on the human body is the ovum • 1000 µm in diameter (1 mm)

  13. Two Types of Cells Prokaryotic Eukaryotic

  14. Prokaryotic • Do not have organelles surrounded by membranes • Few internal structures • Example: Bacteria

  15. Eukaryotic • Contain organelles surrounded by membranes • Most living organisms are eukaryotes Plant Animal

  16. “Typical” Animal Cell

  17. “Typical” Plant Cell

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