Download Domain Archaea

Domain Archaea
Prokaryotic
Single celled
Live in extreme environments
Methanococcus janaschii
Archaea examples
• Halophiles in the Dead Sea.
• Thermophiles in Yellowstone
Domain Bacteria
prokaryotic, single celled
• Bacterial classified by shape
cocci
bacilli
spirillum
Streptococcus pyogenes
Bacillus anthracis
Treponema pallidum
Bacteriology
>10 trillion on/in a human
Heterotrophs  energy from breaking down
organic compounds from environment
Autotrophs  make own food source
example: cyanobacteria
Cyanobacteria
Oscillatoria
Gleocapsa
• Some bacteria are bioluminescent
Examples of bacteria used in lab – non
pathogenic
E. coli K12
Bacillus subtilis , soil bacterium
Staphlyococcus epidermis
Found on skin, not pathogenic
Gram stain – the first step in
identifying disease-causing bacteria
• The stain detects difference in the cell wall
– Gram positive – contain peptidoglycan and stain
purple
– Gram negative - stain pink
Results help decide which antibiotic to prescribe
Examples:
• Gram-positive cocci
– Staphylcoccus aureus can cause skin infections and toxic shock
syndrome;
– Streptococcus pneumoniae can cause pneumonia.
• Gram-negative cocci
– Neisseria meningitidis causes meningitis
– Neisseria gonorrhoeae causes the STD gonorrhea.
• Gram-positive bacilli
– Bacillus anthracis can cause skin infections or respiratory death
– Listeria monocytogenes can cause foodborne illnesses.
• Gram-negative bacilli
– Escherichia coli is a common cause of urinary tract infections.
Anatomy
No nucleus
May have flagella
DNA
Cell wall
May have pili
Binary fission is asexual reproduction
• Some bacteria can be killed by antibiotics
This antibiotic on a paper disc killed MRSA
(vancomycin)
This bacterial species is killed by antibiotic 1 and
3 but is resistant to 2 and 4