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cell theory.ppt
- 1. Chapter 7 Section 1 Discovery of Cells
- 2. The Cell Theory • The Cell Theory states that all organisms are composed of similar units of organization called cells.
- 3. Before the Cell Theory people believed in spontaneous generation which means living things come from non living thing Two scientist disproved spontaneous generation.
- 4. Francisco Redi proved that macroorganisms do not spontaneously generate People thought that maggots came from meat. • Redi disproved this in a controlled experiment
- 5. Pasture proved that microoganisms do not spontaneously generate
- 6. Pasture
- 7. Development of Cell Theory •Theodor Schwann and Matthias Schleiden are credited with coming up with the Cell Theory
- 10. The Cell Theory 1. All known living things are made up of cells. 2. The cell is structural & functional unit of all living things. . 3. All cells come from pre-existing cells by division. (No spontaneous generation ).
- 11. Microscopes • The Cell Theory would not exist if it wasn’t for the development of the microscope and the work of others.
- 13. Robert Hooke • In 1663 an English scientist, Robert Hook improved Janssen’s invention.
- 14. Hooke • Hooke observed cork – the remains of dead tree bark • Coined the word CELL • Derived from the Latin 'cellula' which means small compartment.
- 15. Van Leeuwenhoek • Ten years later Anton van Leeuwenhoek used his own single lens microscopes and was the first person to observe bacteria and protozoa.
- 16. Leeuwenhoek’s Microscope • Leeuwenhoek microscopes resemble high power magnifying lenses.
- 17. Compound Light Microscope • Ocular lens times objective lens give total magnification
- 18. Two Basic Cell Types • Prokaryotic Cells Mainly single celled organisms • Eukaryotic Cells Mainly multicellular organisms, although some are single celled (amoeba,algae, yeast)
- 19. Prokaryotic Cell • Prokaryotes have no membrane bound organelles. • Example – bacteria cell
- 20. Eukaryotic Cells • Eukaryotes – contain membrane bound organelles • Example – plant and animal cells
- 21. Organelles • An organelle is a small specialized structure inside of a cell. • An example of an organelle is the nucleus which controls cell functions.