Info

Algae

Fungi

Protozoa

Cell Organization

Single- or multicellular

Single- or multicellular

Single-celled

Source of Energy

Sunlight

Organic compounds

Organic compounds

Size

Microscopic or macroscopic

Microscopic or macroscopic

Microscopic

12 Chapter 1 Humans and the Microbial World

Figure 1.9 Viruses that Infect Three Kinds of Organisms (a)Tobacco mosaic virus that infects tobacco plants. A long hollow protein coat surrounds a molecule of RNA. (b) A bacterial virus (bacteriophage), which invades bacteria. Nucleic acid is surrounded by a protein coat (head). (c) Influenza virus, thin section.

50 nm

Figure 1.9 Viruses that Infect Three Kinds of Organisms (a)Tobacco mosaic virus that infects tobacco plants. A long hollow protein coat surrounds a molecule of RNA. (b) A bacterial virus (bacteriophage), which invades bacteria. Nucleic acid is surrounded by a protein coat (head). (c) Influenza virus, thin section.

50 nm

Figure 1.11 Prion Prions isolated from the brain of a scrapie-infected hamster. This neurodegenerative disease is caused by a prion.

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