1. Prokaryotic and Eukaryotic Cells
Two types of cells
Prokaryotic and Eukaryotic Cells

2. What is a cell?
It took a long time for people to discover cells and figure out what they were all about.
They need sophisticated equipment (microscopes) to be able to see cells.
Everything we know about cells we call “cell theory”

3. Cells come in all shapes and sizes!

4. Cells – the Reason they are small…
Cell size is limited.
-As cell size increases, it takes longer for material to move from the outside to the inside of the cell and vice versa
*Cells need to have high Surface Area -to- volume ratio
which means it has to have more area on the outside than on the inside to take in food and get rid of wastes

5. There are 2 types of cells:
Prokaryotes
Eukaryotes
True
Bacteria
Archaea-Bacteria
Animal
Plant

6. Prokaryotic Cells

7. Prokaryotic Cells:
A prokaryotic organism is a single celled organism (unicellular) that does not have a nucleus.
Examples of Prokaryotic organisms are:
True Bacteria
Archaea-bacteria

8. Traits of prokaryotes All bacteria cells are prokaryotes.
They do NOT have a nucleus
Their genetic material (DNA) is located in the Nucleoid region.
They do NOT have membrane-bound organelles.
They are less complicated than eukaryotes.
All bacteria cells are prokaryotes.

9. Prokaryotic Cell Diagram

10. Prokaryotic Cell Parts:
_______________ do not have a membrane-bound ______________.
- the genetic material (_________) is in the _____________region
Prokaryotic Cells
Nucleus
DNA
Nucleiod

11. Prokaryotic Cell Parts:
Prokaryotic cell walls
Protects the cell
Helps the cell keep its shape

12. Prokaryotic Cell Parts
Flagella (pl.) or Flagellum (sing.)
long, tail-like structure
used for movement

13. Prokaryotic Cell Parts:
Ribosomes
the place where protein is made
Usually found floating in the cytoplasm

14. Shapes of Prokaryotes Spirillum – spiral shaped
Coccus or Cocci (pl.) – circular or sphere like
Bacillus – rod or pill shaped

15. We need bacteria to live!
Bacteria are decomposers and without them all other organisms would not be able to survive.
We use bacteria in our digestive system to help digest our food. There are approximately ten times as many bacterial cells as human cells in the human body!
We could not make cheese or yogurt or many other foods without bacteria.