1. TYPES OF Bacteria: Archaebacteria: Eubacteria: Prokaryotes Prokaryotes
Hetero/autotrophic
Live in extreme environments
Have DNA sequences similar to eukaryotes and are thought to be their ancestors
Eubacteria:
Prokaryotes
Hetero/autotrophic
Live everywhere

2. Structure of a Bacterial Cell:
Strong cell wall; prevents bursting
DNA in single circular chromosome (no nucleus)
Plasmid: small ring of DNA
DNA

3. Shapes of Bacteria: ( Please research and draw how they look like)
Cocci: round shaped
Bacilli: rod shaped
Spirilla: spiral shaped

4. Bacteria replicate (reproduce) by:
Binary Fission: Bacteria reproduce by dividing in half (asexual)
Conjugation: hollow bridge forms b/t cells and genes exchanged (sexual-
called “promiscuity”)

5. The importance of bacteria: (bad)
Cause disease (pathogens)
Ex: strep throat, tetanus, Lyme disease, tooth decay, salmonella, tuberculosis
Fewer deaths from bacterial infections because of sanitation and hygiene (sterilization/pasteuri-zation by heat, disinfectants)
Lyme disease

6. The importance of bacteria: (good)
Recycle nutrients through decomposition
Nitrogen fixation: convert nitrogen into a form plants can use
Foods: cheese, yogurt
Medicines: produce antibiotics to kill bacteria by blocking growth /reproduction; insulin

7. 2 minute review with a partner
How do bacteria reproduce?
Each give one good thing about bacteria.
Each give something bad caused by bacteria.