Section 3

Modern Classification

• The phylogenetic analysis of rRNA nucleotide sequences led to a new "tree of life" consisting of three domains aligned with six kingdoms.

• The three domains are Bacteria, Archaea, and Eukarya.

• Domain Bacteria aligns with Kingdom Eubacteria, which consists of single-celled prokaryotes that are true bacteria.

• Domain Archaea aligns with Kingdom Archaebacteria, which consists of single-celled prokaryotes that have distinctive cell membranes and cell walls.

• Domain Eukarya includes the kingdoms Protista, Fungi, Plantae, and Animalia. All members of this domain have eukaryotic cells.

Vocabulary

Bacteria (p. 347) Archaea (p. 347) Eukarya (p. 348)

Eubacteria (p. 348) Archaebacteria (p. 349)

Protista (p. 349) Fungi (p. 350)

Plantae (p. 350) Animalia (p. 350)

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