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The Microbial W orld. Chapter 5 http:// =1TmHlcMDIOQ. Microorganisms. All three domains have microogranism representation What are those three domains? Without microorganisms there would be no life on earth. . Domain: Bacteria. Domain: Archaea.

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the microbial w orld

The Microbial World

Chapter 5

  • All three domains have microogranism representation
  • What are those three domains?
  • Without microorganisms there would be no life on earth.
primary producers
Primary producers
  • Microorganisms are the most important primary producers
  • Directly or indirectly feed most marine animals
  • Small
  • Structurally simple
  • Oldest life forms on earth
    • Carry out nearly all the chemical processes more complex organisms do
  • Some unique processes to prokaryotes
  • Most chemical processes evolved first in prokaryotes
prokaryote structure
Prokaryote Structure
  • Cell wall
  • Lack a nucleus
  • Lack membrane bound organelles
  • Differ from Eukaryotes in
    • Shape of DNA – circular shape
    • Size of ribosomes
two prokaryotic domains
Two Prokaryotic Domains
  • Bacteria
  • Archaea
  • Even these two prokaryotic domains have important differences
  • Bacteria and Archaea are as different from each other as they are from humans! Woah!
  • Discovery ed
  • Structurally simple
  • Classified as prokaryotes
  • Evolved a range of metabolic abilities
  • Abundant in all parts of the ocean
  • Shapes
    • Spheres, rods, sprials, rings

-Ridged cell wall with slimy covering (attach to surfaces)

size of bacteria
Size of bacteria
  • Smaller than unicellular eukaryotes.
  • Exception- bacteria found in sediment off southwest Africa- large enough to be seen with the naked eye
where do they live
Where do they live
  • Can grow to extremely high numbers in favorable conditions
    • Detritus (particles of dead organic matter)
  • Decay bacteria – break down waste products and dead organic matter
    • Releases nutrients into the environment
why are they important
Why are they important
  • As we know bacteria are very abundant – Marine environment offers some new discoveries
  • Make up large part of the organic material that feeds bottom-dwellers
  • Important in dredging oil and other toxic pollutants
  • Bad side- spoil fish and shellfish catches
  • Blue-green algae
  • Photosynthetic
    • Pigments chlorophyll
    • Phycocyanin (Blue)
    • Phycoerythrin (Red)
  • Visible color depends on the relative amounts of the two pigments
  • Where among the first photosynthetic organisms on earth.
    • Accumulation of oxygen in our atmosphere
  • Stromatolites- Massive calcareous mounds formed by cyanobacteria.
    • Date back to 3 million years
  • Endolithic- burrow into calcareous rocks and coral skeletons
  • Red tides- caused by a planktonic form that blooms
    • Some can cause skin rashes on divers and swimmers
  • Epiphytes- on algae and plants
  • Endophytes- live inside algae
bathroom break
Bathroom Break
  • 
  • Some times called archaebacteria
  • Simple
  • Primitive life
  • Important role in the early evolution of life
  • Small
  • Spherical, spiral, rod shaped
  • Despite being prokaryotic, there is evidence that archaea are more closely related to eukaryotes than bacteria
where do they live1
Where do they live?
  • Some groups were discovered recently
  • Extreme environments
    • Hot sulfur springs, saline lakes, highly acidic or alkaline environments
    • Extremophiles “lovers of extreme environments”
  • Also found in extreme marine environments
  • They are not restricted to extreme environments
    • Common in the water column and other marine environments
exit ticket
Exit Ticket
  • 1)Blue green algae are known as
  • a) Archaea b) Extremophiles c) Cyanobacteria d) Cilliates
  • 2) Which of the following is not a domain a) Archaea b) Bacteria c) Eukaryota d) Fungi
  • 3) Bacteria and Archaea are very closely related
  • a) True b) False
  • 4) Stramenopiles are made up of
  • a)Cyanobacteria b) Diatoms c) Dinoflagellates d) Amebas
  • 5) Bacteria are prokaryotes
  • a) True b) False