1. History of Cell Discovery
Chapter 4

2. Microscope view of cells
Robert Hooke – first to see cells!
designed microscope that he was
able to view cork cells with (1665).
Named “Cells” because
they look like monk quarters
Cells with stone beds

3. Microscope view of cells
Anton Van Leeuwenhoek – first to see living cells.
improved design, and was
able to view red blood cells
and bacteria.
Called them "animalicules"

4. Scientists of Cell Theory
Theodore Schwann – zoologist who observed that the tissues of animals had cells (1839)

5. Scientists of Cell Theory
Mattias Schleiden – botanist who observed that the tissues of plants had cells (1845)

6. Scientists of Cell Theory
Rudolf Virchow – reported that every living thing is made up of cells, and that these cells must come from other cells.

7. Cell Theory All living things are made of one or more cells.
2. Cells are the basic unit of structure and function in organisms.
(the smallest unit that can perform life functions)
3. All cells come from pre - existing cells.

8. Terms
Cell – the smallest unit that can carry on the processes of life.
Unicellular – consists of only one cell
Multicellular – consists of more than one cell

9. Basic cell Structures Cell Membrane – outer boundary
Nucleus – control center
Cytoplasm – stuff between membrane & nucleus

10. Two Basic Cell Types
Prokaryotic – lacks internal structures surrounded by membranes.
Has a cell membrane & a cell wall
Has NO nucleus.
Means “before the nucleus”
Usually Unicellular organisms
Ex: Bacteria

11. Two Basic Cell Types
Eukaryotic – contains internal membrane bound structures.
Has a nucleus
Has a cell membrane
Usually multicellular organisms
Ex: Plants, animals, and protists