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Cell Theory
Cells and Heredity
Hans & Zacharias Janssen
• Produced the first
compound
microscope - 1590
Robert Hook
Source: http://www.ucmp.berkeley.edu/history/hooke.html
• Robert Hooke
observed cork through
an early microscope.
• He drew the
illustration shown on
the left.
• First to call spaces in
corks “cells” - 1665
• He called the
individual units cells
after the monk’s
rooms in a monastery.
Cork Cells
Compare the photograph of cork cells viewed through a
modern light microscope to Hooke’s drawing.
Source: http://biology.clc.uc.edu/Fankhauser/Labs/Cell_Biology/Cells_Lab/cork_100x_PA021953c.JPG
Anton van Leeuwenhoek
• Observed living
things through
simple microscope –
1680’s
• Stated the cell is the
basic unit of life.
• Discovered bacteria
from saliva in his
mouth
Single Cell Life Form
Source: http://www.umanitoba.ca/faculties/science/biological_sciences/lab3/images/bacillus.gif
Timeline
Source: http://www.biology.arizona.edu/cell_bio/tutorials/cells/cells3.html
Matthias Jakob Schleiden
• Discovered that
plants are composed
of cells. - 1838
Plant Cell Light Microscope
Source: http://www.umanitoba.ca/faculties/science/biological_sciences/lab3/images/lightplt.jpeg
Plant Cell EM Image
Source: http://www.umanitoba.ca/faculties/science/biological_sciences/lab3/images/eukplant3.jpeg
Theodor Schwann
• Discovered that
animals are
composed of cells. 1839
Animal Cell Light Image
Source: http://www.umanitoba.ca/faculties/science/biological_sciences/lab3/images/lightani.jpeg
Animal Cell EM Image
Source: http://www.umanitoba.ca/faculties/science/biological_sciences/lab3/images/eukanimal5.jpeg
Animal Tissue
Source:
http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20102/Bio%20102%20Laboratory/animal%20
tissues/img001.jpg
Rudolf Ludwig Karl Virchow
• Stated that living
things come from
other living things –
• Cells come from cells.
– 1855
Plant Cell Division
Cells
come
from
other
cells
Source: http://www.extension.iastate.edu/nutrition/supplements/folic_acid.php
Animal Cell Division
Cells
come
from
other
cells
Source: http://www.luc.edu/depts/biology/dev/urchindv.jpg
Single-Cell Organism
Cells
come
from
other
cells
Source: http://ebiomedia.com/gall/classics/Paramecium/images/para4.jpg
Cell Theory
• What are all life forms made of?
• Where do new cells come from?
• What is the smallest form of life?
Cell Theory
1. All life forms are made from one or more
cells.
2. Cells only arise from pre-existing cells.
3. The cell is the smallest form of life and
perform similar necessary functions.