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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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Bacterial Vaginosis Facts

Bacterial Vaginosis Facts

This fact sheet is designed to provide you with information on Bacterial Vaginosis. Bacterial vaginosis is an abnormal vaginal condition that is characterized by vaginal discharge and results from an overgrowth of atypical bacteria in the vagina.

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