1. Let’s Learn About the Two Types of Cells
What is the difference between a prokaryote and a eukaryote?

2. What are Prokaryotes?
Prokaryotes are the simplest life forms exhibiting cellular structure, and were Earth’s first cells.
Two major forms
(kingdoms):
Eubacteria and
Archaebacteria
Example: Bacteria
Color-enhanced scanning electron micrograph showing Salmonella (red) invading cultured human cells
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3. Prokaryotes live in many environments
Prokaryotes are the Earth’s most abundant inhabitants. They can survive in a wide range of environments and obtain energy in a variety of ways.
Ex. Deep ocean volcano hot springs
Left to right; deep sea prokaryote; prokaryote from volcano; prokaryotes from Yellowstone National Park hot springs
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4. Prokaryotes are simple
They have no nucleus, and no membrane-bound organelles
They may have flagella or cilia for movement
As a single-celled organism, it has to conduct all life processes itself.

5. How did eukaryotes come about?
Eukaryotes arose from prokaryotes
They developed into larger, more complex organisms
Includes plants, animals, fungi & protists
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6. Prokaryotes and Eukaryotes
ALL cells have two characteristics in common: 1. surrounded by a barrier (cell membrane) 2. At some point in their lives, they contain DNA 3. contain cytoplasm and ribosomes
Two major differences:
Prokaryotes
NO nucleus; no membrane-bound organelles
Eukaryotes
Have a nucleus and membrane-bound organelles

7. Contain membrane-bound organelles
Prokaryotes
Eukaryotes
Larger & complex;
Includes plants, animals, fungi & protists
Simplest life forms
Earth’s first cells
Most abundant inhabitants
Cytoplasm
ribosomes
Cell membrane
DNA
No nucleus; no membrane-bound organelles
Great variety: single-celled to multi-cellular organisms
May have flagella or cilia for movement
Archaea = “Ar kay ah”
2 Major forms: Eubacteria
& Archaebacteria
Contain membrane-bound organelles
Ex. bacteria

8. Eukaryotic Cells
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