1. Bacteria
Friend or Foe

2. Characteristics Bacteria belong to 2 Domains
Domain Bacteria = eubacteria
Domain Archae = archaebacteria
Lack a nucleus = Prokaryote
Single Celled
Have a cell membrane
No organelles (ie: mitochondria, ribosome)

3. Domains of Bacteria Archaebacteria - “Ancient” Bacteria
Live in harsh environments (hot springs & thermal vents) = Extremophiles
Eubacteria – “True” Bacteria
Found most everywhere
Common bacteria (ie: E.coli & Salmonella)

4. The 2 Domains
Archaebacteria
Eubacteria

5. THE TOP DECK CABIN

6. Shapes of Bacteria Bacteria come in 3 basic shapes
Round = Coccus (cocci)
Rod = bacillus (bacilli)
Spiral = Spirilla (Spirochetes)

7. Cool Pictures of Bacteria
Coccus = Round
Bacillus = Rod
Spirlla = Spiral

8. More Shapes
By adding prefixes to the names of bacteria we can be more specific on the shapes.
Diplo = pair
Strepto = chain
Staphylo = cluster

9. More Cool Pictures
Strepto
Diplo
Staphylo

10. Bacteria Movement
Most bacteria have a whip-like filament used for movement called a flagella

11. Importance of Bacteria
Live in Intestines
Help digest food
Make vitamins
Decomposers
Breakdown organic compounds
Helps make lots of products
Tan leather
Vinegar
Yogurt, Cheese, Sauerkraut, Pickles
Antibiotics

12. Viruses A nonliving strand of genetic material within a protein coat
Because they are considered nonliving, they do not belong to any Kingdom
No organelles to take in nutrients or use energy
Cannot move
Cannot replicate on their own
Most viruses range in size from 5 to 300 nanometers.
I.O.W. so small half a billion of them can fit on the head of a pin

13. Virus (physical) Structure
Core of nucleic acid surrounded by a protein coat = CAPSID
Core = DNA or RNA (not both)

14. Viral Infection In order to replicate, a virus must enter a host cell.
The virus attaches to the host cell using specific receptors on the plasma membrane
Many viruses cannot be transmitted between different species.

15. Different Types of Viruses
Chicken Pox
Small Pox
HIV

16. How Viruses Work
Viruses are considered parasites, they must invade a living host in order to reproduce and survive.
This process harms the host organism
Viruses have specific hosts
Plant viruses ONLY invade… PLANTS
Animal viruses ONLY invade… ANIMALS
Bacterial viruses ONLY invade … BACTERIA

17. Viruses & Disease
Animal Viruses = Mumps, Polio, AIDS, Influenza, Colds, Chicken Pox, Small Pox, Ebola, West Nile
Plant Viruses = There is a virus that attacks almost every vegetable and fruit
Bacterial Viruses = attack all types of Bacteria
Ebola
Bacteriophages

18. Any Questions?
That’s all folks!