18.3 Kingdoms and Domains. Updates to Linnaeus’ System a. Some organisms had to be reclassified as...

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


Animals-Heterotrophs (must consume food)

-No cell wals

-Multi-cellular


Fungi-Heterotrophs

-Cell wall (made of hard chitin)

-Mostly multi-cellular


Protista-The “left overs” kingdom

-Autotrophs or heterotrophs

-Cell wall or no cell wall

-Multi-cellular or uni-cellular

BRAIN POP II!

18.3 Kingdoms and Domains. Updates to Linnaeus’ System a. Some organisms had to be reclassified as...

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