CELL THEORY AND CELL SCIENTISTS
INTRODUCTION BELLRINGER!!!
1. Trillion!!! Upto 60 trillion cells can be in a human
2. Animal. Because it is round! Does not have Cell wall or
Chloroplasts
3. The microscope!!!!
TODAY WE WILL…
Describe the key events leading to
the development of the cell theory
• IMPORTANCE: THE CELL THEORY IS THE UNIFYING THEME IN
BIOLOGY BECAUSE IT EMPHASIZES THE SIMILARITY OF ALL LIVING
THINGS.
THE CELL THEORY
State the cell theory...
 Living things are composed of one or more
cells
 Cells are the basic units of structure and
function of all living things
 New cells arise from pre-existing cells.
ADDITIONS TO THE CELL THEORY
•
In addition to being a unit of structure,
cells are also units of reproduction,
heredity and function.
•All cells have essentially the same
chemical composition
Early
Scientists’
Contributions
EARLY SCIENTISTS AND THE CELL
THEORY A TED
• SEE WEBSITE
ZACHARIUS JANSEN (1595)
First simple microscope.
Anton van Leeuwenhoek
(1670’s-1700)
First
compound
light
Microscope
 First to see bacteria
Robert Hooke (1665)
Coined the
term “cell”
Robert Brown (1831)
 Discovered that plant cells had a
special central part that he called
the nucleus
Matthias Schlieden (1838)
All plants are made of
cells
Theodore Schwann (1839)
All animals are made of cells
Rudolf Virchow (1858)
Cells can only arise from
preexisting cells
OTHER IMPORTANT PEOPLE
Dutrochet- chlorophyll identification
Dujardin- sarcodes and protoplasm
Pasteur- studied bacterial cells
Marqulis- organelles were once
free living from themselves
Questions...
Who used the first microscope?
Who said that plants were made
of cells
Who coined the term “cell”?
Who said that all animals were
made of cells?
Who said that cells must come
from existing cells?
Text Assignment: Read pages
Pages 182-186 and 191-200
 Complete Vocabulary cornell style
in notebook
 Organelle, Eukaryotic,
Prokaryotic
 Homework!!! Study all of today’s
notes for a quiz on cell theory and
cell scientists NEXT CLASS!!!!