1. Cell Theory

2. In 1665, Robert Hooke used an early compound microscope to look at a thin slice of cork, a plant material. Cork looked like thousands of tiny, empty chambers. Hooke called these chambers “cells.”

3. Discoveries leading to cell theory:
1665 – Robert Hooke saw and named cells
1838 – Matthias Schleiden concluded that all plants were made of cells
1839 – Theodor Schwann stated that all animals were made of cells
1855 – Rudolph Virchow concluded that new cells were created only from division of existing cells.

4. Cell Theory All living things are made of cells
Cells are the basic unit of structure and function of living things
Cells come from preexisting cells by reproduction

5. All cells have:
Cell membrane – controls what enters and leaves the cell
DNA – genetic material

6. 2 categories of cells: Prokaryotes Eukaryotes No nucleus
No membrane bound organelles
Ex: bacteria
Have a nucleus
Have membrane bound organelles
Ex: Plants, Animals,
Fungi, Protists

7. Prokaryote
Eukaryote

8. 1. What are the 3 parts of cell theory?
All living things are made of cells
Cells are the basic unit of structure and function of living things
Cells come from preexisting cells by reproduction

9. 2. What 2 things do all cells have?
Cell membrane – controls what enters and leaves the cell
DNA – genetic material

10. 3. How do prokaryotes differ from eukaryotes?
Prokaryotes do not have a nucleus
Eukaryotes do have a nucleus.