Section 8.1 Cell Site
The Discovery of Cells
Section 8.1
pages 190-195
History of the Cell Theory
How do we view cells?
What did the discovery of cells have to do with human history?
What is the cell theory?
Who discovered cells?
Vocabulary Words
Cell
Compound Light Microscope
Cell Theory
Electron Microscope
Prokaryote
Eukaryote
Organelle
Nucleus
Microscopes
Simple Vs. Compound Microscopes
Light Microscopes
Scanning Electron Microscopes (SEM)
Transmission Electron Microscopes (TEM)
People Who Studied Cells
Anton van Leeuwenhoek
1600’s
Used a high power magnifying glassRobert Hooke
1665
Used a crude compound microscope to observe the cells in cork (from an oak tree)People Who Studied Cells
Matthias Schleiden
1830
Observed various plant cellsThomas Schwann
1830
Observed various animal cellsThese two and other scientists developed the cell theory during the 1800’s
The Cell Theory
1. All organisms are composed of one or more cells.
2. The cell is the basic unit of organization of organisms.
3. All cells come from preexisting cells.
Two Basic Types of Cells
Prokaryotic
Lack internal structures surrounded by a membrane
no true nucleus
Eukaryotic
Contains internal structures surrounded by a membrane
have a true nucleus
Questions
Why are microscopes necessary for the study of cells?
Compare SEM and TEM microscopes.
Compare prokaryotic and eukaryotic cells.
If a microscope has a 15x eyepiece and three lenses of 6x, 40x, and 95x what are the three magnification powers?