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Bacteria Evolution

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Bacteria which thrive in areas of high salt concentration. Salt normally dehydrates organisms ... Cyanobacteria: autotrophic bacteria. Create oxygen for life on earth ... – PowerPoint PPT presentation

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Title: Bacteria Evolution


1
Bacteria Evolution and Classification
2
Bacteria Evolution
  • Believed to be 1st oldest life on earth
  • 1) Simplest cell structure
  • 2) Oldest fossils known (3.5 byo)
  • Adapted to most environments

Oldest Fossil Pictures
3
Archaebacteria
  • Live in extreme environments
  • Offer glimpse of early earth
  • 3 Main Categories
  • 1) Methanogens
  • 2) Halophiles
  • 3) Thermophiles

4
Archaebacteria
  • 1) Methanogens
  • Anaerobic
  • Produce methane gas as a waste product
  • Habitat Swamps, sewage, digestive tract

5
Archaebacteria
  • 2) Thermophiles
  • Heat and acid loving bacteria
  • Habitat Deep sea vents, volcanoes, hot springs
    (230F)

6
Archaebacteria
  • 3) Halophiles
  • Bacteria which thrive in areas of high salt
    concentration
  • Salt normally dehydrates organisms
  • Use salt to make energy

7
Archaebacteria The 6th Kingdom?
8
Eubacteria (Modern Bacteria)
  • Common to most environments on Earth
  • Often identified by Gram Stain test
  • Gram negative stains pink (harder to treat
    because of thick capsule)
  • Gram positive stains purple (easier to treat)
  • Treatments differ depending upon results

9
Gram Stain Overview
10
Eubacteria (Modern bacteria)
  • Cyanobacteria autotrophic bacteria
  • Create oxygen for life on earth
  • Created Earths ozone layer to block ultraviolet
    radiation (UV) from the sun
  • Oxygen (O2) is recombined into ozone (O3) in the
    stratosphere
  • Allows life to live on land

11
Pollution Alert!
  • The Problem The ozone layer is thinning!
  • The Cause Manmade chemicals (CFCs) from industry
  • CFCs break apart ozone molecules
  • More UV radiation strikes Earths surface
  • The Solution Reduce CFC use plant more trees

12
Ozone Layer Harm Sources
13
Ozone layer
14
O3 destroyed by chlorine from CFCs
15
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16
Gram Positive or Gram Negative?
Gram Negative
17
Quick Review
  • Bacteria occupy most habitats
  • Monerans were 1st life on Earth
  • Cyanobacteria were 1st to make oxygen
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