1. Microscopes Provide the Windows to the World of the Cell
The Cell Theory
Microscopes Provide the Windows to the World of the Cell

2. The Men Anton Van Leeuwenhoek (1600’s) Credit for the first microscope
Looked at pond water and saw “wee beasties”

4. Robert Hooke Observed plant stems, wood, and cork (1600’s)
Saw all the tiny chambers and called them CELLS
What cell part did Hooke observe?
Cell Wall

6. Robert Brown (1833)
Observed that cells had a dark structure within plant cells
Brown observed the nucleus

7. Matthias Schleiden (1838) Stated that all plants are made of Cells
Made many observations of plants around the area

8. Theodor Schwann (1839) Stated that all animals are made of Cells
Observed many animal tissues

9. Rudolf Virchow (1855)
Stated that all cells come from pre-existing cells
Cells arise from the division of pre-existing cells

10. The Cell Theory All living things are composed of cells
Cells are the basic unit of structure and function in living things
All cells come from pre-existing cells

11. Exceptions to the Cell Theory
Viruses – are not cellular
Mitochondria and chloroplast – each contain genetic material and can reproduce