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  1. These are called CELLS They were first named by ROBERT HOOKE
  2. Cell Theory Presented by Kesler Science
  3. What are the building blocks of life? Essential Question:
  4. Objective I can explain the components of cell theory.
  5. Cell • Smallest structural and functional unit of an organism • Usually microscopic • Two main types of cells: 1. Prokaryotic (no nucleus) 2. Eukaryotic (has a nucleus) Cell Theory
  6. Robert Hooke • Observed bark of cork trees under a microscope • Thought the objects looked liked individual rooms in a monastery, which were called cells • Called his discovery cells • Did not know their true function Cell Theory
  7. Anton van Leeuwenhoek • Developed the microscope lens to see greater magnification • First person to observe bacteria Cell Theory 1670
  8. Matthias Schleiden • Concluded all plant tissues are composed of cells • Declared that the cell is the basic building block of all plant matter. Cell Theory
  9. Cell Theory Theodor Schwann •Concluded that all animal tissues are composed of cells, too. •Collaborated with Schleiden to form a new theory in biology
  10. Cell Theory • Schleiden and Schwann’s ideas became known as the cell theory. 1. All organisms are composed of cells. 2. Cells are the basic unit of life. • This theory was as important to biology as the atomic theory was to chemistry. Cell Theory There was one more piece of the puzzle to cell theory. Where did these cells come from?
  11. Cell Theory Rudolph Virchow • Proposed that all cells result from the division of previously existing living cells • This idea became a key piece of the modern cell theory.
  12. Cell Theory Modern Cell Theory 1. All organisms are composed of cells. 1. Cells are the basic unit of life. 1. All cells come from the division of previous existing cells.
  13. Cell Theory Functions of Cells • Metabolism- chemical reactions inside the cell • Response – perceiving and responding to changes in the environment • Homeostasis – keeping conditions inside the organism within tolerable limits (balanced) Homeostasis
  14. Cell Theory Functions of Cells (continued) • Growth – increase in size • Reproduction – producing offspring (sexually or asexually) • Nutrition – Obtaining food to provide energy for growth • Defense – protection against enemies Growth
  15. Quick Action – Cell Theory Let’s see how good you memory is. There were 7 cell functions listed on the last two slides. Have your teacher give you another peek at them and then write down as many as you can remember.