• Robert Hooke - uses the word “cells” to describe cork.• Anton van Leeuwenhoek -

observes tiny microorganisms with his microscope.

•Matthias Schleiden - “all plants are made of cells”• Theodor Schwann - “all

animals are made of cells”

• Rudolf Virchow - Cell Theory1.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.

• All cells have a cell membrane • All cells are filled with

cytoplasm • All cells have some sort of

genetic material

•Prokaryotes – using Latin P&S prokaryote means before nucleus

• Prokaryotes –Do NOT have Nucleus or

organelles–Generally smaller and simpler –All bacteria are prokaryotes

• Eukaryotes – using Latin P&S eukaryote means true nucleus

–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

- No nucleus

- Bacteria

-Cell membrane

-Cytoplasm

-DNA

-Has nucleus

-Plants, animals and fungus