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  Section: Introduction to Botany » Bacteria
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Characteristics of Bacteria

  Is Bacteria a Plant?
  The Original Bacteria
  Modern, Aerobic Bacteria
  Characteristics of Bacteria
  Benefits of Bacteria
  Hazards of Bacteria
  Identifying Bacteria
  Bacterial Growth

Bacteria resemble plants in that they have rigid cell walls, although the walls are generally of nitrogen rather than cellulose. Some forms have flagella, while others are nonmotile. Bacteria have ribosomes and nucleic acids but lack mitochondria, plastids, and the central vacuole. Bacteria are distinguished from each other, in part, on the basis of their shapes. Rod-shaped bacteria are called bacilli, round forms are called cocci, and curved forms are called spirilli. Cocci can occur in pairs (diplococci), clusters (staphylococci), or chains (streptococci).

Types of bacteria.
Figure 11-2 Types of bacteria.


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