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World 2 · Bacteria: Friends and Foes · 13 min · PRO

How a few bacteria cause illness

Pathogens, toxins and germ theory

PRO · Microbe Zoo

World 2: Bacteria: Friends and Foes is part of PRO

The first world of Microbe Zoo is free. PRO opens the other 27 lessons in 6 worlds — simulations, quizzes and all.

  • Anatomy of a bacterium
  • Shapes and the Gram stain
  • Bacteria that work for us
  • Binary fission: one becomes two
  • The doubling rule: N = N₀ × 2^(t/td)
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  • Practice exams and certificates

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