Domains & Kingdoms

The Current System

• What is the largest category?

• What is alive?

• They must have the 8 characteristics of life.

• Biotic vs. Abiotic

• Is a virus alive?

Life ?

• What is a virus?

• DNA with a protein coat.

• Does it have the 8 characteristics of life?

• Lets review.

The 8 Characteristics of Life

• Does a virus have all 8? 1. Made of Cells2. Has DNA3. Needs Energy and Materials4. Reproduces5. Grows and Develops6. Reacts to the Environment7. Maintains Homeostasis 8. Has Adaptations

Domain?

• All life has cells.–Not all cells are the same.

What kinds of cells do we know of?

• ProkaryotesProkaryotes – no “membrane bound” organelles, very small, bacteria, circular DNA, most abundant on Earth.

• EukaryotesEukaryotes – has “membrane bound” organelles (e.g. nucleus, mitochondria, chloroplast), large, unicellular or multicellular, linear DNA– Plant (autotrophs) or Animal (heterotrophs)– Stop thinking plant or animal for this unit…fungi?

The 3 Domains• Archaea - Prokaryotes

• Bacteria - Prokaryotes

• Eukarya - Eukaryotes

Prokaryotes – 2 Kingdoms2 Kingdoms 2 Domains2 Domains

• Domain BacteriaDomain Bacteria– EubacteriaEubacteria

• The largest Domain

• Most prokaryotes are in this group.

• Domain ArchaeaDomain Archaea– ArchaeabacteriaArchaeabacteria

• Extremophiles• Live in extreme

environments.• Boiling hot springs,

hydrothermal vents, salty lakes.

• Scientists think these were the first life on earth.

Eukaryotes – 4 Kingdoms4 Kingdoms 1 Domain1 Domain

• Domain EukaryaDomain Eukarya–Animalia Animalia - Animals

–Plantae Plantae - Plants

–Fungi Fungi - Fungus

–Protista Protista - Protists

6 Kingdoms (The Current System)

• Eukaryote Cells– Animalia - heterotrophs

(multicellular)– Plantae - autotrophs

(multicellular)– Fungi - heterotrophs

(multicellular)– Protista - autotrophs &

heterotrophs (single celled)

• Prokaryote Cells– Eubacteria -

autotrophs & heterotrophs (single celled)

– Archaeabacteria - autotrophs & heterotrophs (single celled)