Early Scientists and
their discoveries
What is a cell?
 1655-
Robert Hooke (British)
 Was
the first person
to name and observe
a cell.
 Observed tiny
structures while
looking at a slice of
cork.
 1670’s
– Anton Van
Leeuwenhoek
(Dutch)
 Father
of the modern
microscope
 First person to see
living cells in pond
water
 1838
– Matthias Schleiden
 Botanist*
who stated
that all plants are
made up of cells.
 *Botanist-
person
who studies plants
 1838
– Theodor
Schwann (German)
 Biologist*
who said all
animals are made of
cells
 *Biologist-
person who
studies all forms of
living organisms
 1858
- Rudolph Virchow
(German)
 Was
the first to see cells
divide
 Stated that all living
things come from other
living things.
Review

Together, these scientists’ discoveries led to the development of cell theory.

Cell Theory Has 3 Parts
• 1. All living things are made of cells
• 2. Cells are the basic unit of structure in living things
• 3. Living cells come from other living cells
CELL THEORY HAS THREE (3) PARTS
1. All living things are made of one or more cells.
2. Cells are the basic unit of structure and function in living things
3. Living Cells come only from other living cells
Cell Theory
Bacteria Cells under a Microscope