The Cell
Scientists,
Microscopes, and
Cell Theory Notes
All physical matter is organized in a
specific way, beginning with the smallest
unit, an atom.
Atoms Molecules Cells Tissues Organs Systems Organisms
Carbon CaCO3 Osteocytes Bone Tissue Bone Skeleton Human
•  Cell: Basic building block of all
living matter
•  2 types:
Unicellular (1 cell) ex: bacteria
Multicellular (1+ cell) ex: humans
Robert Hooke (1665)
- observed pieces of cork
from the bark of a cork tree
under the microscope
- led him to coin the word
cell (little rooms)
- compared the small
boxes to the small rooms
that monks lived in
http://www.learner.org/channel/courses/essential/life/
session1/closer1.html
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Anton van Leeuwenhoek
(1674)
Matthias Schleiden (1839)
•  German botanist
•  He is known as the
Father of Microscopy.
•  First to see living cells
•  Discovered that all PLANTS
were made of cells
•  Contributed to the creation
of the cell theory
http://www.britannica.com/eb/
article-9066147/Mathias-Jacob-Schleiden
http://en.wikipedia.org/wiki/Anton_van_Leeuwenhoek
Theodor Schwann (1839)
Rudolph Virchow (1855)
•  German pathologist
•  German zoologist
•  He is known as the
Father of Pathology
•  Concluded that all
ANIMALS are made of cells
•  Discovered that all living cells
come only from other living
cells
•  Contributed to the creation
of the cell theory
http://www.nndb.com/people/357/000096069/
http://en.wikipedia.org/wiki/Image:Rudolf_Virchow.jpg
•  Contributed to the creation of
the cell theory
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Microscopes
•  Cells were first observed in the 1600s when
the compound microscope was invented.
–  Capable of magnifying 1000 times
•  Total Magnification: Eyepiece X Objective
Light Microscope
Uses light and lenses
to magnify an image.
Steps for use:
Focus on an image with the
lowest objective, sharpen
with the fine focus, increase
magnification.
SEM Microscope
(Scanning Electron Microscope)
Capable of
magnifying with much
more detail.
Steps for use:
The Cell Theory
•  Major Contributors:
•  Matthias Schleiden
•  Theodor Schwann
•  Rudolph Virchow
Uses electron beams to
detect molecular
composition of a specimen.
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The Cell Theory
1.  All living things are made of
cells.
2.  Cells are the basic units of
structure and function in living
things.
3.  Living cells come only from other
living cells.
Prokaryote & Eukaryote
Drawing (p.5 notebook)
•  Draw, label, color, & descriptions
Fig. 7.2 p. 174 textbook.
•  On the BACK of p.5 write & answer
the following:
1.  Which is larger in size (prokaryote
or eukaryote)?
2.  Define prokaryote & eukaryote.
3.  List 3 organelles prokaryotes &
eukaryotes have in common.
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