The microbial w orld
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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.

Domain archaea
Domain: Archaea

Domain eukaryota
Domain: Eukaryota

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