18.3 kingdoms and domains. updates to linnaeus’ system a. some organisms had to be reclassified as...
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18.3 Kingdoms and Domains
Updates to Linnaeus’ System
a. Some organisms had to be reclassified as we learned more
-Example: Sponges had to be reclassified from plants to animals when microscopes were used to see the type of cells they had.
b. Changed from 2 to 6 kingdoms.
-Linnaeus- 2 kingdoms (plants, animals)
-Now- 6 kingdoms!
Sponges
Organisms Classified Using Five Characteristics:
1. Cell Type- Prokaryote or Eukaryote
2. Cell Wall- Does it have one?
3. Body type- Unicellular or multicellular
4. Nutrition- Heterotroph or autotroph
5. Genetics-Similiarities in DNA.
Three Domains:
1.Bacteria-Unicellular prokaryotes that have a strong cell wall and unique genetic system. Same as the eubacteria kingdom.
2. Archaea-Unicellular prokaryotes that have chemically unique cell walls. They live in extreme environments. Same as the Archeabacteria kingdom. BRAIN POP!
3. Eukarya-Organisms made up of eukaryotic cells. (Plants, animals, fungi and protists).
Characteristics of Eukaryotes
Plants-Autotrophs (make their own food).
-Cell Walls (made of hard cellulose)
-Mostly multi-cellular
Characteristics of Eukaryotes
Animals-Heterotrophs (must consume food)
-No cell wals
-Multi-cellular
Characteristics of Eukaryotes
Fungi-Heterotrophs
-Cell wall (made of hard chitin)
-Mostly multi-cellular
Characteristics of Eukaryotes
Protista-The “left overs” kingdom
-Autotrophs or heterotrophs
-Cell wall or no cell wall
-Multi-cellular or uni-cellular
BRAIN POP II!