1. Cell Theory and Prokaryote vs. Eukaryote

2. What is a Cell? Cell – Basic unit of living things.
Organisms are either:
Unicellular – made of one
cell such as bacteria and
amoebas. OR
Multicellular – made of
many cells such as plants
and animals.

3. Scientists to Remember
Robert Hooke (1665) – Observed “cells” in cork

4. Anton van Leeuwenhoek (1674)
Father of Microscopy
Saw tiny living things in pond water.

5. Cell Theory
Confirmed discoveries that all scientists believe to be true about cells:
1. Cells are the basic unit of life.
2. All living things are made of cells.
3. New cells are produced from existing cells.

6. Microscopes
Light Microscope – magnifies tiny organisms up to 1,000 times.
-Uses light and lenses.
-We use these.
Electron Microscope – magnifies
up to a million times.
-Uses electrons.

7. The Discovery of Cells Prokaryotic before nucleus Eukaryotic true

8. Eukaryotes Has a nucleus with a nuclear envelope
Bigger and more complex than prokaryotes
Have membrane bound Organelles (golgi, ER, lysosomes…etc)
DNA – double-stranded and forms chromosomes (highly organized)
Can be uni- OR multicellular organisms
Ex: animals, plants, fungi

9. Prokaryotes NO nucleus NO membrane bound organelles (just ribosomes)
ALL are unicellular
Smaller than eukaryotic cells
Forerunner to eukaryotic cells (smaller and more simple)
DNA – single strand and circular
Ex: ALL Bacteria 11

10. Similarities 1 Contain all four biomolecules 2 Have ribosomes
(lipids, carbs, proteins, and nucleic acids)
2 Have ribosomes
3 Have DNA
4 Similar Metabolism
5 Can be unicellular
6 Have cell/plasma membranes or cell wall

11. Eukaryote VS. Prokaryote Picture