Cell Theory

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Cell Theory

  1. 1. The Cell Theory A Timeline
  2. 2. Late 1500’s • Hans and Zacharias Janssen • Dutch lens grinders, father and son • produced first compound microscope (2 lenses) Late 1500’s
  3. 3. Robert Hooke ( 1665) • Used light microscope to look at thin slices of plant tissues -- cork • Looked empty, like monk’s chamber • Called tiny chambers “cells”
  4. 4. • Looked at pond water organisms • First to see living microscopic organisms. • Made careful sketches. Anton von Leeuwenhoek (1673)
  5. 5. Matthias Schleiden -- 1838 • German Botanist (studied plants) • Viewed plant parts under a microscope • Discovered that plant parts are made of cells • He concluded: “All plants are made of
  6. 6. Theodore Schwann -- 1839 • German scientist who studied animals - zoologist • Saw that all animals he studied were cellular so concluded: “All animals are made of cells.”
  7. 7. Rudolf Virchow - 1855 • German physician who studied cell reproduction • “Where a cell exists, there must have been a preexisting cell.”
  8. 8. The Cell Theory • All living things are composed of one or more cells. • The cell is the basic unit of life in all living things. • New cells are produced from existing cells.
  9. 9. Cell Similarities • Cells come in many shapes and sizes with different duties but … • All are surrounded with a cell membrane • All cells have hereditary material (DNA) • All have cytoplasm and organelles. Cytoplasm is the fluid within a cell which provides a safe environment for the organelles. Organelles are the structures within the cell that have specific duties to make the cell a functioning unit.
  10. 10. Two Types of Cells • Eukaryotic • Are complex and of different types. • Have a nucleus and many organelles. • Contain more DNA due to different jobs within the cell. DNA is linear (in a line). • Possess a cell membrane or a cell wall. • All living things other than bacteria.
  11. 11. Two Types of Cells • Prokaryotic • Contain no nucleus. • Have no membrane covered organelles, but do have ribosomes to make protein. • Possess circular DNA. • Are bacteria.

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