The Cell Theory
What is a cell?
• The cell is a basic building block of living
things, both plant and animal.
All living things have cells.
• Plants
• Animals
Tool used to view cells
What is the Cell Theory?
Cell Theory – Part 1
• All living organisms are made up of one or
more cells.
Cell Theory – Part 2
• The cell is the smallest form of structure
and function in living things.
Cell Theory – Part 3
• All cells come from other pre-existing cells.
(Mitosis)
Which of the following is NOT true?
A. All things, living and nonliving, are made
up of cells.
B. All living things are made of one or more
cells.
C. All cells come from pre-existing cells.
D. The cell is the basic unit of structure and
function.
Which is TRUE?
A. All cells come from dead or pre-existing
cells.
B. All things, living and nonliving, are made
up of cells.
C. All living things are made up of multiple
cells.
D. The cell is the smallest form of structure
and function.
Scientists of The Cell
Theory
Zacharias
Janssen
Robert
Hooke
Anton Von
Mathias
Leeuwenhook Schleiden
Theodor
Schawnn
Rudolph
Virchow
Timeline - 1590
• Hans and Zacharias Janssen (1590),
Dutch lens grinders, father and son.
Produced first compound microscope
(2 lenses).
Timeline- 1665
• Robert Hooke (1665), English Scientist,
looked at a thin slice of cork through a
compound microscope and observed tiny,
hollow, room like structures. He was the
first to call the spaces in the cork
“cells”.
Timeline-1680
• Anton van Leeuwenhook (1680), Dutch
Amateur Scientist, looked at blood, rain
water and scrapings from teeth observed
living cells through a simple microscope.
Timeline-1838
• Matthias Schleiden (1838), German
Botanist, viewed plant parts under a
microscope and discovered that plants
are made of cells.
Timeline-1839
• Theodor Schwann (1839), German
Zoologist, viewed animals parts under a
microscope and discovered that animals
are made of cells.
Timeline- 1855
• Rudolf Virchow (1855), German
Physician, stated that “living cells come
from other living cells”.
Can you put the scientists in order?
•
•
•
•
•
•
Virchow
Hooke
Schleiden
Leeuwenhook
Shwann
Janssen