Transcript III. Domain Archaea and The Early Earth

The Diversity of Life
I. An Overview
II. An Overview of 'The Bacteria'
III. Domain Archaea and The Early Earth
The Diversity of Life
I. An Overview
II. An Overview of 'The Bacteria'
III. Domain Archaea and The Early Earth
The three Archaean groups exploit
extreme environments (like early Earth?):
The Diversity of Life
I. An Overview
II. An Overview of 'The Bacteria'
III. Domain Archaea and The Early Earth
The two Archaean groups exploit extreme
environments (like early Earth?):
Crenarchaeota:
'thermacidophiles' - reduce
sulphur compounds in geothermal
sulphur springs and geothermal vents.
The Diversity of Life
I. An Overview
II. An Overview of 'The Bacteria'
III. Domain Archaea and The Early Earth
The two Archaean groups exploit extreme
environments (like early Earth?):
Crenarchaeota:
'thermacidophiles' - reduce
sulphur compounds in geothermal
sulphur springs and geothermal vents.
Euryarchaeota:
'methanogens' - reduce CO2
and harvest small amounts of energy.
The Diversity of Life
I. An Overview
II. An Overview of 'The Bacteria'
III. Domain Archaea and The Early Earth
The two Archaean groups exploit extreme
environments (like early Earth?):
Crenarchaeota:
'thermacidophiles' - oxidize
sulphur compounds in geothermal
sulphur springs and geothermal vents.
Euryarchaeota:
'methanogens' - reduce CO2
and harvest small amounts of energy.
'halophiles' - live in saline
environments; some have a very primitive
form of photosynthesis.
The Diversity of Life
IV. Domain Eubacteria
- Proteobacteria:
a diverse group including photosynthetic sulphur bacteria (using H2S
as an electron donor in photosynthetic pathways), mitochondria relatives, and
some human pathogens (Salmonella, Vibrio cholerae)
The Diversity of Life
IV. Domain Eubacteria
- Proteobacteria:
a diverse group including photosynthetic sulphur bacteria (using H2S
as an electron donor in photosynthetic pathways), mitochondria relatives, and
some human pathogens (Salmonella, Vibrio cholerae)
- Cyanobacteria:
probably the first oxygenic photosynthetic organisms, they are similar
structurally and physiologically to chloroplasts in eukaryotes.
The Diversity of Life
IV. Domain Eubacteria
- Proteobacteria:
a diverse group including photosynthetic sulphur bacteria (using H2S
as an electron donor in photosynthetic pathways), mitochondria relatives, and
some human pathogens (Salmonella, Vibrio cholerae)
- Cyanobacteria:
probably the first oxygenic photosynthetic organisms, they are similar
structurally and physiologically to chloroplasts in eukaryotes.
- Spirochaetes:
motile and often parasitic pathogens (syphilis, Lyme disease)
The Diversity of Life
IV. Domain Eubacteria
- Proteobacteria:
a diverse group including photosynthetic sulphur bacteria (using H2S
as an electron donor in photosynthetic pathways), mitochondria relatives, and
some human pathogens (Salmonella, Vibrio cholerae)
- Cyanobacteria:
probably the first oxygenic photosynthetic organisms, they are similar
structurally and physiologically to chloroplasts in eukaryotes.
- Spirochaetes:
motile and often parasitic pathogens (syphilis, Lyme disease)
- Chlamydias: exclusively parasitic
- Firmicules: spore-forming pathogens - Staph, TB, tetanus
The Diversity of Life
I. An Overview
II. Introduction to the 'Bacteria'
IIV. Domain Archaea and The Early Earth
IV. Domain Eubacteria
IV. Domain Eukarya
The Diversity of Life
IV. Domain Eukarya
A. Characteristics
- membrane bound nucleus
- organelles
- sexual reproduction
infolding of membrane
The Diversity of Life
IV. Domain Eukarya
B. Origins
The Diversity of Life
IV. Domain Eukarya
B. Origins
endosymbiosis - mitochondria and
chloroplasts (Margulis - 1970's)
The Diversity of Life
IV. Domain Eukarya
C. Phylogeny
The Diversity of Life
IV. Domain Eukarya
D. Diversity
The Diversity of Life
IV. Domain Eukarya
D. Diversity
The Diversity of Life
IV. Domain Eukarya
D. Diversity
Foraminifera
The Diversity of Life
IV. Domain Eukarya
D. Diversity
The Diversity of Life
IV. Domain Eukarya
D. Diversity
The Diversity of Life
IV. Domain Eukarya
D. Diversity
- green alga
Same chlorophyll as
plants
alternation of
generation
genetic analysis
confirms relatedness
The Diversity of Life
IV. Domain Eukarya
D. Diversity
- Choanoflagellates