Notebook

1
Notebook 7 Bacteria

2
Characteristics

• Prokaryotes
• Bacteria do not have any internal compartments
• No nucleus
• No organelles

3
Characteristics

• Cell Size
• Most bacteria are 1 micrometer in diameter
  (10 times smaller than a Eukaryote)

Eukaryote
Bacteria
4
Characteristics

• Chromosomes
• 1 circular piece of DNA
• Plasmid small circular DNA

VS
Eukaryotic linear DNA
Circular Bacteria DNA
5
Characteristics

• Reproduction
• Bacteria reproduce by simple cell division called
  binary fission
• (They pinch themselves into 2)

6
(No Transcript)
7
Characteristics

• Movement
• Some bacteria have flagella
• Flagella is a single fiber like a corkscrew

8
Flagella
9
Characteristics

• Metabolic diversity
• Anaerobic (does not require oxygen)
• Aerobic (requires oxygen)

10
Structures

• Bacillus
• Rod shaped

11
Structures

• Coccus
• Round/ball shaped

12
Structures

• Spirillum
• Spiral shaped

13
Structures

• Cell wall
• Have cell walls made of peptidoglycan
• Location and thickness of cell wall help identify
  different types of bacteria.
• tions improve

14
Structures

• Pili
• Appendages that help bacteria adhere or stick to
  a surface
• Some help bacteria exchange genetic material
  (conjugation tube)

15
Conjugation Pili
16
Obtaining Energy

• Photosynthesis
• Make own food from (sun) light energy
• Live in H20, are anaerobic

17
Obtaining Energy

• Heterotrophs
• Consumes food for energy
• They are the principal decomposers
• Most are aerobic

18
(No Transcript)
19
Virtuous Bacteria

• Bacteria are good!
• Without them we would not have
• Yogurt, cheese, pickles, olives, etc.
• A good digestive tract
• Decomposers
• Protection inside and out