Today’s Objective
Given information about the
development of cell theory,
summarize the contributions
of scientists and/or state the
cell theory.
Early Scientists
Anton van Leeuwenhoek
Firstcompound light
microscope
Robert Hooke
Coined the term “cell”
Matthias Schlieden
All plants are made of
cells
Theodor Schwann
All animals are made of
cells
Rudolf Virchow
Cells can only arise
from pre-existing cells
Cell Theory
1. The cell is the basic unit of
structure.
2. The cell is the basic unit of
function.
3. All cells arise from pre-
existing cells.
Spontaneous Generation?
Francesco Redi
Germ Theory of Disease
Microscopicorganisms
cause diseases.
Pasteur
Why do we care
today?
?