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2. The History of the Cell Theory
 Anton van Leeuwenhoek (1600s)
 Advanced the microscope and used it to study microscopic
organisms
 “The father of microbiology”
 Robert Hooke (1600s)
 Discovered and named „cells‟
 Matthias Schleiden (1830s)
 All plants are made of cells
 Theodor Schwann (1840s)
 All animals are made of cells

3. The Cell Theory
 All organisms are composed of one or more cells
 The cell is the basic unit of structure and
organization of organisms
 All cells come from preexisting cells

7. The Compound Light
Microscope
To calculate
magnification…
 Find the magnification of
each lens (objective and
eyepiece)
 Multiply the magnification
of each lens
~1500x magnification

8. The Electron Microscope
 Uses a beam of electrons
in a vacuum to magnify up
to 500,000x
 2 types

9. Scanning Electron
Microscope

10. Transmission Electron
Microscope

11. 2 Basic Cell Types
 All cells contain small specialized structures called
organelles
 Many, but not all, organelles are surrounded by
membranes
 Organisms with cells that contain membrane bound
organelles are called eukaryotes
 Organisms without cells that contain membrane
bound organelles are called prokaryotes

13. The Nucleus
 Contains the DNA
 Responsible for cell
division
 Manages and controls
cellular functions