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Classification of Living Things Part 1: The Domains

Classification of Living Things Part 1: The Domains. Classification. Classification the process of grouping things according to similarities. Living (Biotic) Contain one or more cells Are able to: Respond to stimuli from its surroundings Use chemicals to Grow Reproduce

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Classification of Living Things Part 1: The Domains

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  1. Classification of Living ThingsPart 1: The Domains

  2. Classification Classification • the process of grouping things according to similarities.

  3. Living (Biotic) Contain one or more cells Are able to: Respond to stimuli from its surroundings Use chemicals to Grow Reproduce Maintain stable internal living conditions Non-Living (Abiotic) Not made of cells Unable to grow, reproduce, or respond to stimuli. Living vs. Non-Living

  4. Classification of Life • Living things are split into many different categories called Domains. • A Domain is the largest group of living things • There are 3 Domains of Life • Archaea • Bacteria • Eukaryotes

  5. Domain Archaea • The oldest of all life (“archaea” means ancient) • Prokaryotic cell structure (no nucleus) • Microscopic • No cell parts (organelles) • Genetic material free-floats in the cell • Found in extreme environments ( named “extremophiles”) including in animal digestive systems (methanogens)

  6. Where to Find Extremophiles… Extremophiles live in extreme (places where most life could not exist) conditions. • These locations include: • Highly acidic regions • Extreme cold/hot temperature • Hot springs • High radiation • High salt regions • Sulfur vents at the bottom of the oceans

  7. Domain Bacteria Rod Shaped Bacteria • Prokaryotic cell structure (no nucleus) • Heterotrophic or autotrophic • Microscopic • No cell parts (organelles) • Genetic material free-floats in the cell • Three basic shapes • Rods • Spheres (Coccus) • Spirals Sphere Shaped Bacteria Spiral Shaped Bacteria

  8. What is the difference between Archaea and Bacteria? Simply, the differences are the chemicals that make up the two Archaea are extremophiles (thermophiles, acidophiles and thermoacidophiles) • This means they exist where living things “should not be able to live”

  9. Domain Eukarya • Eukaryotes can be unicellular or multi-cellular • Eukaryotes can be autotrophic or heterotropic • The word eukaryote (eu- “true”/ karyo- “nucleus” /ote- “having to do with”) describes organisms that have a nucleus Platypus Protozoa

  10. Domain Eukarya • The nucleus of a cell controls the function of a cell and holds all the genetic material for the cell (similar to what the brain does for a body) • Organisms in the Domain Eukarya are more complex than the organisms in the Domain Bacteria and Domain Archaea • Organisms in the Domain Eukarya include: • plants • animals • fungi • protists

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