Which system of classification should be used?• 5-Kingdom system

- All Prokaryotes grouped in Kingdom Monera- Eukaryotes grouped in separate Kingdoms

• 6-15 Kingdom system- Prokaryotes divided among 2-3 separate Kingdoms- Protists divided among many Kingdoms

Figure 27.2 The three domains of life

Prokaryotes

• earliest known organisms

- 3.5 BYA

- They’re (almost)Everywhere!

+ incomparably bountiful and omnipresent

+ hot, cold, salty, acidic, alkaline

Figure 27.3 The most common shapes of prokaryotes

Figure 27.4x2 Prokaryotes and eukaryotic cell

Figure 27.5 Gram-positive and gram-negative bacteria

Figure 27.5x Gram-positive and gram-negative bacteria

Figure 27.6 Pili

Figure 27.x1 Prokaryotic flagella

Figure 27.x2 Prokaryotic flagella (A. serpens)

Figure 27.x3 Prokaryotic flagella (Bacillus)

Figure 27.9 Prokaryote colonies in culture

Figure 27.10 An anthrax endospore

Figure 27.10x Endospores

Figure 27.x1 Prokaryotic conjugation

Table 27.1 Major Nutritional Modes

Figure 27.11 One of the most independent organisms on earth: Cyanobacteria (Anabaena)

Figure 27.11x1 Cyanobacteria: Gloeothece (top left), Nostoc (top right), Calothrix (bottom left), Fischerella (bottom right)

Figure 27.11x2 A bloom of cyanobacteria