Reinforcing Key Points

13.1 The Simplest Organisms

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13.2 Comparing Bacteria to Eukaryotes

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13.3 Importance of Bacteria

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13.4 Kinds of Bacteria

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13.5 Bacterial Lifestyles

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13.6 The Discovery of Viruses

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13.7 The Structure of Viruses

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13.8 How Bacteriophages Enter Cells

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13.9 How Animal Viruses Enter Cells

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13.10 Disease Viruses

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13.11 Prions and Viroids

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