1. KEY CONCEPT _____ are the _____ ____ of ____.

2. The ____ ______ grew out of the work of ____ _________ and __________ in the _________.
Many scientists contributed to the cell theory
Hooke: _________ ____ while looking at ____ under the __________.
Leewenhoek: 1st to observe ________ & ________ (_______; ______)
Schleiden: ______ ___ composed of ____.
Schwann: ________ are composed of _____.
Virchow: _____ come from other _____.

3. The cell theory grew out of the work of many scientists and improvements in the microscope.
Many scientists contributed to the cell theory.
More was learned about ____ as ___________ ________.
The ____ ______ is a _________ _______ of _______.

4. Early studies led to the development of the cell theory.
The Cell theory has _____ __________.
All __________ are made of ____.

5. Early studies led to the development of the cell theory.
The Cell theory has three principles.
All organisms are made of cells.
All _________ _____ are produced by ____living ____.

6. Early studies led to the development of the cell theory.
The Cell theory has three principles.
All organisms are made of ____.
All existing cells are produced by _____ ______ ____.
The ____ is the most _____ ____ of ____.

7. All cells share certain characteristics. Cells tend to be __________.
____________ cells lack a ______ and ____ _______ __________ of ____________ cells.
All cells share certain characteristics.
Cells tend to be __________.
All cells are ________ by a ________.
All cells are filled with __________.
cell membrane
Bacterium
(colored SEM; magnification 8800x)
cytoplasm

8. There are two cell types: __________ cells and ________ cells.
__________ cells have a ________.
___________ cells do not have ________ ______ __________.
nucleus
organelles
cell membrane

9. There are two cell types: eukaryotic cells and prokaryotic cells.
____________ cells do ___ have a ________.
___________ cells do not have ________-_____ ___________.
nucleus
organelles
cell membrane
cytoplasm