2. Robert Hooke - uses the word “cells” to describe cork. Anton van Leeuwenhoek - observes tiny microorganisms with his microscope.

3. Matthias Schleiden - “all plants are made of cells” Theodor Schwann - “all animals are made of cells”

4. Rudolf Virchow - Cell Theory 1.All living things are composed of cells. 2.Cells are the basic unit of structure and function in living things. 3.New cells come from preexisting cells.

5. All cells have a cell membrane All cells are filled with cytoplasm All cells have some sort of genetic material

7. Prokaryotes – using Latin P&S prokaryote means before nucleus

8. Prokaryotes – Do NOT have Nucleus or organelles – Generally smaller and simpler – All bacteria are prokaryotes

9. Eukaryotes – using Latin P&S eukaryote means true nucleus

10. – HAVE nuclei – Also have dozens of other specialized structures called ORGANELLES – Can be found in single-celled organisms or multi-celled organisms – All plants, animals and fungi are eukaryotes

11. -No nucleus -Bacteria -Cell membrane -Cytoplasm -DNA -Has nucleus -Plants, animals and fungus