1. Section 3-1 “Cells”

2. KEY CONCEPT: Cells are the Basic unit of life.

3. Many scientists contributed to the cell theory.
The cell theory grew out of the work of many scientists and improvements in the microscope.
Many scientists contributed to the cell theory.

4. Robert Hooke: 1665 - First to identify cells and named them “cells.”
Anton Van Leeuwenhoek: 1674 – Made more powerful lenses. Able to view living cells – greater detail.
Matthias Scheiden: 1838 – First to propose that plants are made of cells.
Theodor Schwann: 1839 – Published theory that all living things are made of cells.
Rudolf Virchow: 1855 – Proposed that all cells come from preexisting cells.

5. The Cell Theory:
1. All organisms are made of cells

6. 2. All existing cells are produced by other living cells

7. 3. The cell is the most basic unit of life

8. All cells share certain characteristics:
Cells tend to be microscopic.
All cells are enclosed by a membrane.
All cells are filled with cytoplasm.
cell membrane
Bacterium
(colored SEM; magnification 8800x)
cytoplasm

9. There are two cell types: 1. Eukaryotic cells: Have a nucleus
Have membrane bound organelles
Usually multi-cellular
Example:
plants, animals
nucleus
organelles
cell membrane

10. 2. Prokaryotic cells:
Do not have a nucleus
Do not have membrane-bound organelles
Usually single-celled
Example: bacteria
cell membrane
cytoplasm

17. Overview of the Cell Structure Golgi Apparatus / Protein Modification
Videos
Overview of the Cell Structure
Golgi Apparatus / Protein Modification