Lab 2: Protists. Protists! Lab Goals Identify the three domains of life and the main characteristics of each Define protists and know why the group “Protista”

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Presentation transcript:

Lab 2: Protists

Protists!

Lab Goals Identify the three domains of life and the main characteristics of each Define protists and know why the group “Protista” is not an appropriate taxon Be able to recognize the main supergroups, subgroups, and kingdoms of protists Practice microscope skills

5 Kingdoms or 6 Kingdoms? Separation based on rRNA sequences. Kingdom Monera is comprised of 2 separate monophyletic groups: 1.Eubacteria 2.Archaebacteria

Phylogenetic tree of Domain Eukarya (“Protista” in yellow) Why is Protista not a good kingdom?

Solution: Domain (Eukarya) Supergroup Subgroup Kingdom Phylum Etc.

Linnaeus kingdoms Haeckel kingdoms Chatton empires Copeland kingdoms Whittaker kingdoms Woese et al kingdoms Woese et al domains (not treated)Protista ProkaryotaMonera EubacteriaBacteria ArchaebacteriaArchaea Eukaryota Protista Eukarya VegetabiliaPlantae Fungi Plantae Animalia

The Prokaryotic Domains: Bacteria & Archaea Bacteria Domain  Contain Peptidoglycan in Cell Walls. Archaea Domain  Contain Histones associated with DNA.  Likely share more Recent Common Ancestor with Eukaryotes than with Bacteria.  Live EVERYWHERE!

Three Domains of Life Bacteria  No nucleus  Peptidoglycan in cell walls Archaea  No nucleus  Histones associated with DNA. Eukarya  Membrane-bound nucleus and organelles  Histones associated with DNA  Unicellular or Multicellular More closely related to each other than to Bacteria!

What is a protist? Protist=Eukaryote not classified as a plant, animal, or fungi – NOT a monophyletic group!

Why are protists important?

Disease – “Beaver Fever” (Giardia) – Red Tide – Malaria – Toxoplasmosis – African Sleeping Sickness

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